0001621563false12/282020Q30001571371false12/282020Q36.1255.1256.55.25us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization6.1255.1256.55.25us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization00016215632019-12-292020-09-260001621563sum:SummitMaterialsLlcMember2019-12-292020-09-26xbrli:shares0001621563us-gaap:CommonClassAMember2020-10-260001621563us-gaap:CommonClassBMember2020-10-26iso4217:USD00016215632020-09-2600016215632019-12-28iso4217:USDxbrli:shares0001621563us-gaap:CommonClassAMember2020-09-260001621563us-gaap:CommonClassAMember2019-12-280001621563us-gaap:CommonClassBMember2020-09-260001621563us-gaap:CommonClassBMember2019-12-280001621563us-gaap:ProductMember2020-06-282020-09-260001621563us-gaap:ProductMember2019-06-302019-09-280001621563us-gaap:ProductMember2019-12-292020-09-260001621563us-gaap:ProductMember2018-12-302019-09-280001621563us-gaap:ServiceMember2020-06-282020-09-260001621563us-gaap:ServiceMember2019-06-302019-09-280001621563us-gaap:ServiceMember2019-12-292020-09-260001621563us-gaap:ServiceMember2018-12-302019-09-280001621563sum:ExcludingShippingAndHandlingMember2020-06-282020-09-260001621563sum:ExcludingShippingAndHandlingMember2019-06-302019-09-280001621563sum:ExcludingShippingAndHandlingMember2019-12-292020-09-260001621563sum:ExcludingShippingAndHandlingMember2018-12-302019-09-280001621563us-gaap:ShippingAndHandlingMember2020-06-282020-09-260001621563us-gaap:ShippingAndHandlingMember2019-06-302019-09-280001621563us-gaap:ShippingAndHandlingMember2019-12-292020-09-260001621563us-gaap:ShippingAndHandlingMember2018-12-302019-09-2800016215632020-06-282020-09-2600016215632019-06-302019-09-2800016215632018-12-302019-09-280001621563us-gaap:CommonClassAMember2020-06-282020-09-260001621563us-gaap:CommonClassAMember2019-06-302019-09-280001621563us-gaap:CommonClassAMember2019-12-292020-09-260001621563us-gaap:CommonClassAMember2018-12-302019-09-2800016215632018-12-2900016215632019-09-280001621563us-gaap:RetainedEarningsMember2019-12-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-280001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-12-280001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2019-12-280001621563us-gaap:AdditionalPaidInCapitalMember2019-12-280001621563sum:NoncontrollingInterestInLpMember2019-12-280001621563us-gaap:RetainedEarningsMember2019-12-292020-03-280001621563sum:NoncontrollingInterestInLpMember2019-12-292020-03-2800016215632019-12-292020-03-280001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-12-292020-03-280001621563us-gaap:AdditionalPaidInCapitalMember2019-12-292020-03-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-292020-03-280001621563us-gaap:RetainedEarningsMember2020-03-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-280001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2020-03-280001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2020-03-280001621563us-gaap:AdditionalPaidInCapitalMember2020-03-280001621563sum:NoncontrollingInterestInLpMember2020-03-2800016215632020-03-280001621563us-gaap:RetainedEarningsMember2020-03-292020-06-270001621563sum:NoncontrollingInterestInLpMember2020-03-292020-06-2700016215632020-03-292020-06-270001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-292020-06-270001621563us-gaap:AdditionalPaidInCapitalMember2020-03-292020-06-270001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2020-03-292020-06-270001621563us-gaap:RetainedEarningsMember2020-06-270001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-270001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2020-06-270001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2020-06-270001621563us-gaap:AdditionalPaidInCapitalMember2020-06-270001621563sum:NoncontrollingInterestInLpMember2020-06-2700016215632020-06-270001621563us-gaap:RetainedEarningsMember2020-06-282020-09-260001621563sum:NoncontrollingInterestInLpMember2020-06-282020-09-260001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-282020-09-260001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2020-06-282020-09-260001621563us-gaap:AdditionalPaidInCapitalMember2020-06-282020-09-260001621563us-gaap:RetainedEarningsMember2020-09-260001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-260001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2020-09-260001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2020-09-260001621563us-gaap:AdditionalPaidInCapitalMember2020-09-260001621563sum:NoncontrollingInterestInLpMember2020-09-260001621563us-gaap:RetainedEarningsMember2018-12-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-290001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2018-12-290001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2018-12-290001621563us-gaap:AdditionalPaidInCapitalMember2018-12-290001621563sum:NoncontrollingInterestInLpMember2018-12-290001621563us-gaap:RetainedEarningsMember2018-12-302019-03-300001621563sum:NoncontrollingInterestInLpMember2018-12-302019-03-3000016215632018-12-302019-03-300001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2018-12-302019-03-300001621563us-gaap:AdditionalPaidInCapitalMember2018-12-302019-03-300001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-302019-03-300001621563us-gaap:RetainedEarningsMember2019-03-300001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-03-300001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-03-300001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2019-03-300001621563us-gaap:AdditionalPaidInCapitalMember2019-03-300001621563sum:NoncontrollingInterestInLpMember2019-03-3000016215632019-03-300001621563us-gaap:RetainedEarningsMember2019-03-312019-06-290001621563sum:NoncontrollingInterestInLpMember2019-03-312019-06-2900016215632019-03-312019-06-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-03-312019-06-290001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-03-312019-06-290001621563us-gaap:AdditionalPaidInCapitalMember2019-03-312019-06-290001621563us-gaap:RetainedEarningsMember2019-06-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-06-290001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-06-290001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2019-06-290001621563us-gaap:AdditionalPaidInCapitalMember2019-06-290001621563sum:NoncontrollingInterestInLpMember2019-06-2900016215632019-06-290001621563us-gaap:RetainedEarningsMember2019-06-302019-09-280001621563sum:NoncontrollingInterestInLpMember2019-06-302019-09-280001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-06-302019-09-280001621563us-gaap:AdditionalPaidInCapitalMember2019-06-302019-09-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-06-302019-09-280001621563us-gaap:RetainedEarningsMember2019-09-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-09-280001621563us-gaap:CommonStockMemberus-gaap:CommonClassAMember2019-09-280001621563us-gaap:CommonClassBMemberus-gaap:CommonStockMember2019-09-280001621563us-gaap:AdditionalPaidInCapitalMember2019-09-280001621563sum:NoncontrollingInterestInLpMember2019-09-28sum:plant0001621563sum:CementPlantMember2019-12-292020-09-26sum:segmentsum:state0001621563sum:SummitMaterialsLlcMember2020-09-26xbrli:pure0001621563sum:TaxReceivableAgreementMembersum:SummitHoldingsLpMember2019-12-292020-09-26sum:acquistiion0001621563sum:WestMember2019-12-292020-09-260001621563sum:WestMember2018-12-302019-12-280001621563sum:EastMember2019-12-292020-09-260001621563sum:EastMember2018-12-302019-12-280001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember2020-09-260001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember2019-12-280001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember2019-12-292020-09-260001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember2018-12-302019-12-280001621563sum:WestMember2019-12-280001621563sum:EastMember2019-12-280001621563sum:CementMember2019-12-280001621563sum:CementMember2019-12-292020-09-260001621563sum:WestMember2020-09-260001621563sum:EastMember2020-09-260001621563sum:CementMember2020-09-260001621563us-gaap:ConstructionPermitsMember2020-09-260001621563us-gaap:ConstructionPermitsMember2019-12-280001621563us-gaap:LeaseAgreementsMember2020-09-260001621563us-gaap:LeaseAgreementsMember2019-12-280001621563sum:ReserveRightsMember2020-09-260001621563sum:ReserveRightsMember2019-12-280001621563us-gaap:TradeNamesMember2020-09-260001621563us-gaap:TradeNamesMember2019-12-280001621563us-gaap:OtherIntangibleAssetsMember2020-09-260001621563us-gaap:OtherIntangibleAssetsMember2019-12-280001621563sum:AggregatesMember2020-06-282020-09-260001621563sum:AggregatesMember2019-06-302019-09-280001621563sum:AggregatesMember2019-12-292020-09-260001621563sum:AggregatesMember2018-12-302019-09-280001621563sum:CementMember2020-06-282020-09-260001621563sum:CementMember2019-06-302019-09-280001621563sum:CementMember2019-12-292020-09-260001621563sum:CementMember2018-12-302019-09-280001621563sum:ReadyMixedConcreteMember2020-06-282020-09-260001621563sum:ReadyMixedConcreteMember2019-06-302019-09-280001621563sum:ReadyMixedConcreteMember2019-12-292020-09-260001621563sum:ReadyMixedConcreteMember2018-12-302019-09-280001621563sum:AsphaltMember2020-06-282020-09-260001621563sum:AsphaltMember2019-06-302019-09-280001621563sum:AsphaltMember2019-12-292020-09-260001621563sum:AsphaltMember2018-12-302019-09-280001621563sum:PavingAndRelatedServicesMember2020-06-282020-09-260001621563sum:PavingAndRelatedServicesMember2019-06-302019-09-280001621563sum:PavingAndRelatedServicesMember2019-12-292020-09-260001621563sum:PavingAndRelatedServicesMember2018-12-302019-09-280001621563sum:OtherProductsOrServicesMember2020-06-282020-09-260001621563sum:OtherProductsOrServicesMember2019-06-302019-09-280001621563sum:OtherProductsOrServicesMember2019-12-292020-09-260001621563sum:OtherProductsOrServicesMember2018-12-302019-09-280001621563srt:MaximumMember2019-12-292020-09-260001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMemberus-gaap:SeniorNotesMember2020-09-260001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMemberus-gaap:SeniorNotesMember2019-12-280001621563us-gaap:SeniorNotesMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2019-12-280001621563us-gaap:SeniorNotesMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMemberus-gaap:SeniorNotesMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMemberus-gaap:SeniorNotesMember2019-12-280001621563sum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMemberus-gaap:SeniorNotesMember2020-09-260001621563sum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMemberus-gaap:SeniorNotesMember2019-12-280001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberus-gaap:SeniorNotesMember2020-09-260001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberus-gaap:SeniorNotesMember2019-12-280001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMember2020-08-110001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMemberus-gaap:SeniorNotesMember2020-08-112020-08-110001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMember2020-08-112020-08-110001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2020-08-310001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMember2019-03-150001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMemberus-gaap:SeniorNotesMember2019-03-152019-03-150001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SeniorNotes8.5PercentDue2022Member2019-06-290001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SeniorNotes8.5PercentDue2022Member2018-12-302019-03-300001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMember2017-06-010001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMember2017-06-012017-06-010001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2015-07-080001621563sum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeIssuedAtParMembersum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMember2015-07-080001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeIssuedAt99.375PercentOfParMember2015-07-080001621563sum:SummitMaterialsLlcAndSummitMaterialsFinanceCorpMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeIssuedAt99.375PercentOfParMember2015-07-082015-07-080001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMembersum:SummitMaterialsLlcMember2019-02-250001621563sum:FederalFundsEffectiveRateMembersum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMembersum:SummitMaterialsLlcMember2019-02-252019-02-250001621563sum:LondonInterbankOfferedRateLiborPlusOnePercentMembersum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMembersum:SummitMaterialsLlcMember2019-02-252019-02-250001621563sum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMemberus-gaap:LondonInterbankOfferedRateLIBORMembersum:SummitMaterialsLlcMember2019-02-252019-02-250001621563sum:SeniorSecuredCreditFacilityRevolvingCreditFacilityMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SummitMaterialsLlcMembersum:SeniorSecuredCreditFacilityLetterOfCreditMember2020-09-260001621563sum:SeniorSecuredCreditFacilitiesMembersum:SummitMaterialsLlcMember2019-02-252019-02-25iso4217:CAD0001621563sum:CanadianSubsidiaryCreditAgreementOperatingActivitiesMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementOperatingActivitiesMemberus-gaap:PrimeRateMember2015-01-152015-01-150001621563sum:CanadianSubsidiaryCreditAgreementCapitalEquipmentMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementCapitalEquipmentMember2015-01-152015-01-150001621563sum:CanadianSubsidiaryCreditAgreementGuaranteesMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementMember2020-09-260001621563sum:CanadianSubsidiaryCreditAgreementMember2019-12-280001621563sum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMember2020-09-260001621563sum:TaxReceivableAgreementMember2020-09-260001621563sum:TaxReceivableAgreementMember2019-12-280001621563sum:SummitHoldingsLpMember2018-12-302019-09-280001621563sum:SummitHoldingsLpMember2019-12-292020-09-260001621563us-gaap:RestrictedStockMember2020-06-282020-09-260001621563us-gaap:RestrictedStockMember2019-06-302019-09-280001621563us-gaap:RestrictedStockMember2019-12-292020-09-260001621563us-gaap:RestrictedStockMember2018-12-302019-09-280001621563sum:CommonClassAAndRestrictedStockMember2020-06-282020-09-260001621563sum:CommonClassAAndRestrictedStockMember2019-06-302019-09-280001621563sum:CommonClassAAndRestrictedStockMember2019-12-292020-09-260001621563sum:CommonClassAAndRestrictedStockMember2018-12-302019-09-280001621563sum:LimitedPartnershipUnitsMemberus-gaap:CommonClassAMember2020-06-282020-09-260001621563sum:LimitedPartnershipUnitsMemberus-gaap:CommonClassAMember2019-06-302019-09-280001621563sum:LimitedPartnershipUnitsMemberus-gaap:CommonClassAMember2019-12-292020-09-260001621563sum:LimitedPartnershipUnitsMemberus-gaap:CommonClassAMember2018-12-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:EmployeeStockOptionMember2020-06-282020-09-260001621563us-gaap:CommonClassAMemberus-gaap:EmployeeStockOptionMember2019-06-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:EmployeeStockOptionMember2019-12-292020-09-260001621563us-gaap:CommonClassAMemberus-gaap:EmployeeStockOptionMember2018-12-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:RestrictedStockUnitsRSUMember2020-06-282020-09-260001621563us-gaap:CommonClassAMemberus-gaap:RestrictedStockUnitsRSUMember2019-06-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:RestrictedStockUnitsRSUMember2019-12-292020-09-260001621563us-gaap:CommonClassAMemberus-gaap:RestrictedStockUnitsRSUMember2018-12-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:PerformanceSharesMember2020-06-282020-09-260001621563us-gaap:CommonClassAMemberus-gaap:PerformanceSharesMember2019-06-302019-09-280001621563us-gaap:CommonClassAMemberus-gaap:PerformanceSharesMember2019-12-292020-09-260001621563us-gaap:CommonClassAMemberus-gaap:PerformanceSharesMember2018-12-302019-09-280001621563sum:LimitedPartnershipUnitsMember2020-06-282020-09-260001621563sum:LimitedPartnershipUnitsMember2019-06-302019-09-280001621563sum:LimitedPartnershipUnitsMember2019-12-292020-09-260001621563sum:LimitedPartnershipUnitsMember2018-12-302019-09-280001621563us-gaap:EmployeeStockOptionMember2020-06-282020-09-260001621563us-gaap:EmployeeStockOptionMember2019-06-302019-09-280001621563us-gaap:EmployeeStockOptionMember2019-12-292020-09-260001621563us-gaap:EmployeeStockOptionMember2018-12-302019-09-280001621563us-gaap:WarrantMember2020-06-282020-09-260001621563us-gaap:WarrantMember2019-06-302019-09-280001621563us-gaap:WarrantMember2019-12-292020-09-260001621563us-gaap:WarrantMember2018-12-302019-09-280001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2019-12-280001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2019-12-280001621563sum:SummitMaterialsIncMember2019-12-280001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2019-12-292020-09-260001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2019-12-292020-09-260001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2020-09-260001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2020-09-260001621563sum:SummitMaterialsIncMember2020-09-260001621563us-gaap:CommonClassAMember2018-12-290001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2018-12-290001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2018-12-290001621563sum:SummitMaterialsIncMember2018-12-290001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2018-12-302019-09-280001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2018-12-302019-09-280001621563us-gaap:CommonClassAMember2019-09-280001621563sum:LpUnitsMembersum:SummitHoldingsLpMember2019-09-280001621563sum:SummitMaterialsIncorporatedAndSummitHoldingsLPMember2019-09-280001621563sum:SummitMaterialsIncMember2019-09-280001621563sum:SummitHoldingsLpMember2020-09-260001621563sum:SummitHoldingsLpMember2019-12-280001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-280001621563us-gaap:AccumulatedTranslationAdjustmentMember2019-12-280001621563us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-12-280001621563us-gaap:AccumulatedTranslationAdjustmentMember2019-12-292020-09-260001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-09-260001621563us-gaap:AccumulatedTranslationAdjustmentMember2020-09-260001621563us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-09-260001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-290001621563us-gaap:AccumulatedTranslationAdjustmentMember2018-12-290001621563us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2018-12-290001621563us-gaap:AccumulatedTranslationAdjustmentMember2018-12-302019-09-280001621563us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2018-12-302019-09-280001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-09-280001621563us-gaap:AccumulatedTranslationAdjustmentMember2019-09-280001621563us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-09-280001621563sum:SiteRestorationObligationsMemberus-gaap:OtherNoncurrentLiabilitiesMember2020-09-260001621563sum:SiteRestorationObligationsMemberus-gaap:OtherNoncurrentLiabilitiesMember2019-12-280001621563us-gaap:AccountsPayableAndAccruedLiabilitiesMembersum:SiteRestorationObligationsMember2020-09-260001621563us-gaap:AccountsPayableAndAccruedLiabilitiesMembersum:SiteRestorationObligationsMember2019-12-280001621563us-gaap:FairValueInputsLevel3Member2020-09-260001621563us-gaap:FairValueInputsLevel3Member2019-12-280001621563us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2020-09-260001621563us-gaap:FairValueInputsLevel3Member2018-12-302019-09-280001621563us-gaap:FairValueInputsLevel3Member2019-12-292020-09-260001621563us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-260001621563us-gaap:FairValueInputsLevel2Memberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-260001621563us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-280001621563us-gaap:FairValueInputsLevel2Memberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-280001621563us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2020-09-260001621563us-gaap:FairValueInputsLevel3Memberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-260001621563us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2019-12-280001621563us-gaap:FairValueInputsLevel3Memberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-280001621563us-gaap:FairValueInputsLevel2Member2020-09-260001621563us-gaap:FairValueInputsLevel2Member2019-12-280001621563sum:WestMember2020-06-282020-09-260001621563sum:WestMember2019-06-302019-09-280001621563sum:WestMember2018-12-302019-09-280001621563sum:EastMember2020-06-282020-09-260001621563sum:EastMember2019-06-302019-09-280001621563sum:EastMember2018-12-302019-09-280001621563sum:CementMember2020-06-282020-09-260001621563sum:CementMember2019-06-302019-09-280001621563sum:CementMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:WestMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:WestMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:WestMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:WestMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:EastMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:EastMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:EastMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:EastMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:CementMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:CementMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:CementMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:CementMember2018-12-302019-09-280001621563us-gaap:CorporateNonSegmentMember2020-06-282020-09-260001621563us-gaap:CorporateNonSegmentMember2019-06-302019-09-280001621563us-gaap:CorporateNonSegmentMember2019-12-292020-09-260001621563us-gaap:CorporateNonSegmentMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:WestMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:WestMember2019-12-280001621563us-gaap:OperatingSegmentsMembersum:EastMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:EastMember2019-12-280001621563us-gaap:OperatingSegmentsMembersum:CementMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:CementMember2019-12-280001621563us-gaap:OperatingSegmentsMember2020-09-260001621563us-gaap:OperatingSegmentsMember2019-12-280001621563us-gaap:CorporateNonSegmentMember2020-09-260001621563us-gaap:CorporateNonSegmentMember2019-12-280001621563sum:SummitMaterialsLlcMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:ProductMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:ProductMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:ProductMember2019-12-292020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:ProductMember2018-12-302019-09-280001621563us-gaap:ServiceMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563us-gaap:ServiceMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563us-gaap:ServiceMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:ServiceMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:ExcludingShippingAndHandlingMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:ExcludingShippingAndHandlingMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:ExcludingShippingAndHandlingMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:ExcludingShippingAndHandlingMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563us-gaap:ShippingAndHandlingMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563us-gaap:ShippingAndHandlingMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563us-gaap:ShippingAndHandlingMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:ShippingAndHandlingMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMember2018-12-290001621563sum:SummitMaterialsLlcMember2019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-12-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-12-292020-03-280001621563sum:SummitMaterialsLlcMember2019-12-292020-03-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-12-292020-03-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-12-292020-03-280001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2020-03-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2020-03-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2020-03-280001621563sum:SummitMaterialsLlcMember2020-03-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2020-03-292020-06-270001621563sum:SummitMaterialsLlcMember2020-03-292020-06-270001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2020-03-292020-06-270001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2020-03-292020-06-270001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2020-06-270001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2020-06-270001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2020-06-270001621563sum:SummitMaterialsLlcMember2020-06-270001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2020-06-282020-09-260001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2020-09-260001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2018-12-290001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2018-12-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2018-12-290001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2018-12-302019-03-300001621563sum:SummitMaterialsLlcMember2018-12-302019-03-300001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2018-12-302019-03-300001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2018-12-302019-03-300001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-03-300001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-03-300001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-03-300001621563sum:SummitMaterialsLlcMember2019-03-300001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-03-312019-06-290001621563sum:SummitMaterialsLlcMember2019-03-312019-06-290001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-03-312019-06-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-03-312019-06-290001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-06-290001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-06-290001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-06-290001621563sum:SummitMaterialsLlcMember2019-06-290001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-06-302019-09-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:MemberUnitsMember2019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:RetainedEarningsMember2019-09-280001621563us-gaap:AccumulatedOtherComprehensiveIncomeMembersum:SummitMaterialsLlcMember2019-09-280001621563sum:CementPlantMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:SummitMaterialsLlcMembersum:WestMember2019-12-292020-09-260001621563sum:SummitMaterialsLlcMembersum:WestMember2018-12-302019-12-280001621563sum:SummitMaterialsLlcMembersum:EastMember2019-12-292020-09-260001621563sum:SummitMaterialsLlcMembersum:EastMember2018-12-302019-12-280001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMembersum:SummitMaterialsLlcMember2018-12-302019-12-280001621563sum:SummitMaterialsLlcMembersum:WestMember2019-12-280001621563sum:SummitMaterialsLlcMembersum:EastMember2019-12-280001621563sum:SummitMaterialsLlcMembersum:CementMember2019-12-280001621563sum:SummitMaterialsLlcMembersum:CementMember2019-12-292020-09-260001621563sum:SummitMaterialsLlcMembersum:WestMember2020-09-260001621563sum:SummitMaterialsLlcMembersum:EastMember2020-09-260001621563sum:SummitMaterialsLlcMembersum:CementMember2020-09-260001621563us-gaap:ConstructionPermitsMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:ConstructionPermitsMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:LeaseAgreementsMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:LeaseAgreementsMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:ReserveRightsMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:ReserveRightsMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:TradeNamesMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:TradeNamesMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:OtherIntangibleAssetsMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:OtherIntangibleAssetsMember2019-12-280001621563sum:AggregatesMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:AggregatesMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:AggregatesMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:AggregatesMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:CementMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:CementMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:CementMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:CementMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:ReadyMixedConcreteMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:ReadyMixedConcreteMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:ReadyMixedConcreteMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:ReadyMixedConcreteMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:AsphaltMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:AsphaltMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:AsphaltMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:AsphaltMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:PavingAndRelatedServicesMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:PavingAndRelatedServicesMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:PavingAndRelatedServicesMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:PavingAndRelatedServicesMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:OtherProductsOrServicesMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563sum:OtherProductsOrServicesMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563sum:OtherProductsOrServicesMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563sum:OtherProductsOrServicesMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMembersrt:MaximumMember2019-12-292020-09-260001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SeniorSecuredCreditFacilityTermLoanDueTwoThousandTwentyFourMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:SeniorNotesMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:SeniorNotesMembersum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SixPointFivePercentageSeniorNotesDueTwentyTwentySevenMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:FivePointTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberus-gaap:SeniorNotesMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SeniorNotes8.5PercentDue2022Membersum:SummitMaterialsLlcMember2019-06-290001621563sum:SeniorNotes8.5PercentDue2022Membersum:SummitMaterialsLlcMember2018-12-302019-03-300001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMembersum:SummitMaterialsLlcMember2017-06-010001621563sum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMembersum:SummitMaterialsLlcMember2015-07-080001621563sum:CanadianSubsidiaryCreditAgreementOperatingActivitiesMembersum:SummitMaterialsLlcMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementOperatingActivitiesMemberus-gaap:PrimeRateMembersum:SummitMaterialsLlcMember2015-01-152015-01-150001621563sum:CanadianSubsidiaryCreditAgreementCapitalEquipmentMembersum:SummitMaterialsLlcMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementCapitalEquipmentMembersum:SummitMaterialsLlcMember2015-01-152015-01-150001621563sum:CanadianSubsidiaryCreditAgreementGuaranteesMembersum:SummitMaterialsLlcMember2015-01-150001621563sum:CanadianSubsidiaryCreditAgreementMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:CanadianSubsidiaryCreditAgreementMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SixPointOneTwoFivePercentageSeniorNotesDueTwentyTwentyThreeMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:FivePointOneTwoFivePercentageSeniorNotesDueTwentyTwentyFiveMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-12-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2019-12-292020-09-260001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2020-09-260001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-09-260001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersum:SummitMaterialsLlcMember2018-12-290001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2018-12-290001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2018-12-290001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2018-12-302019-09-280001621563us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersum:SummitMaterialsLlcMember2019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedTranslationAdjustmentMember2019-09-280001621563sum:SummitMaterialsLlcMemberus-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-09-280001621563sum:SiteRestorationObligationsMemberus-gaap:OtherNoncurrentLiabilitiesMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SiteRestorationObligationsMemberus-gaap:OtherNoncurrentLiabilitiesMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:AccountsPayableAndAccruedLiabilitiesMembersum:SiteRestorationObligationsMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:AccountsPayableAndAccruedLiabilitiesMembersum:SiteRestorationObligationsMembersum:SummitMaterialsLlcMember2019-12-280001621563sum:SiteRestorationObligationsMembersum:SummitMaterialsLlcMember2020-09-260001621563sum:SiteRestorationObligationsMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMemberus-gaap:MeasurementInputDiscountRateMember2020-09-260001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:FairValueInputsLevel2Membersum:SummitMaterialsLlcMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-260001621563us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:FairValueInputsLevel2Membersum:SummitMaterialsLlcMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-280001621563us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-260001621563us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:FairValueInputsLevel3Membersum:SummitMaterialsLlcMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-280001621563us-gaap:FairValueInputsLevel2Membersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:FairValueInputsLevel2Membersum:SummitMaterialsLlcMember2020-09-260001621563sum:SummitMaterialsLlcMembersum:WestMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMembersum:WestMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMembersum:WestMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMembersum:EastMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMembersum:EastMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMembersum:EastMember2018-12-302019-09-280001621563sum:SummitMaterialsLlcMembersum:CementMember2020-06-282020-09-260001621563sum:SummitMaterialsLlcMembersum:CementMember2019-06-302019-09-280001621563sum:SummitMaterialsLlcMembersum:CementMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2018-12-302019-09-280001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:WestMember2019-12-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:EastMember2019-12-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMembersum:CementMember2019-12-280001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:OperatingSegmentsMembersum:SummitMaterialsLlcMember2019-12-280001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2020-09-260001621563us-gaap:CorporateNonSegmentMembersum:SummitMaterialsLlcMember2019-12-280001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2020-09-260001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2020-09-260001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2020-09-260001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2020-09-260001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2019-12-280001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2019-12-280001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2019-12-280001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2019-12-280001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2020-06-282020-09-260001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2020-06-282020-09-260001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2019-12-292020-09-260001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2019-12-292020-09-260001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2019-06-302019-09-280001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2019-06-302019-09-280001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2018-12-302019-09-280001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2018-12-302019-09-280001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2018-12-290001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2018-12-290001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2018-12-290001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2018-12-290001621563srt:ReportableLegalEntitiesMembersrt:SubsidiaryIssuerMembersum:SummitMaterialsLlcMember2019-09-280001621563srt:ReportableLegalEntitiesMembersrt:GuarantorSubsidiariesMembersum:SummitMaterialsLlcMember2019-09-280001621563srt:ReportableLegalEntitiesMembersum:SummitMaterialsLlcMembersrt:NonGuarantorSubsidiariesMember2019-09-280001621563srt:ConsolidationEliminationsMembersum:SummitMaterialsLlcMember2019-09-28

For the transition period from                      to                       

Commission file numbers:

001-36873 (Summit Materials, Inc.)

333-187556 (Summit Materials, LLC)

SUMMIT MATERIALS, INC.
SUMMIT MATERIALS, LLC
(Exact name of registrants as specified in their charters)

Registrants’ telephone number, including area code: (303) 893-0012

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading symbol(s)

Name of each exchange on which registered

Class A Common Stock (par value $.01 per share)

SUM

New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Summit Materials, Inc.

Yes

☒

No

☐

Summit Materials, LLC

Yes

☒

No

☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S‑T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Summit Materials, Inc.

Yes

☒

No

☐

Summit Materials, LLC

Yes

☒

No

☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Summit Materials, Inc.

Large accelerated filer

☒

Accelerated filer

☐

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

☐

Summit Materials, LLC

Large accelerated filer

☐

Accelerated filer

☐

Non-accelerated filer

☒

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Summit Materials, Inc.

Yes

☐

No

☒

Summit Materials, LLC

Yes

☐

No

☒

As of October 26, 2020, the number of shares of Summit Materials, Inc.’s outstanding Class A and Class B common stock, par value $0.01 per share for each class, was 114,127,616 and 99, respectively.

As of October 26, 2020, 100% of Summit Materials, LLC’s outstanding limited liability company interests were held by Summit Materials Intermediate Holdings, LLC, its sole member and an indirect subsidiary of Summit Materials, Inc.

EXPLANATORY NOTE

 

    This quarterly report on Form 10-Q (this “report”) is a combined quarterly report being filed separately by two registrants: Summit Materials, Inc. and Summit Materials, LLC. Each registrant hereto is filing on its own behalf all of the information contained in this report that relates to such registrant. Each registrant hereto is not filing any information that does not relate to such registrant, and therefore makes no representation as to any such information. We believe that combining the quarterly reports on Form 10-Q of Summit Materials, Inc. and Summit Materials, LLC into this single report eliminates duplicative and potentially confusing disclosure and provides a more streamlined presentation since a substantial amount of the disclosure applies to both registrants.

 

    Unless stated otherwise or the context requires otherwise, references to “Summit Inc.” mean Summit Materials, Inc., a Delaware corporation, and references to “Summit LLC” mean Summit Materials, LLC, a Delaware limited liability company. The references to Summit Inc. and Summit LLC are used in cases where it is important to distinguish between them. We use the terms “we,” “our,” “us” or “the Company” to refer to Summit Inc. and Summit LLC together with their respective subsidiaries, unless otherwise noted or the context otherwise requires.

 

    Summit Inc. was formed on September 23, 2014 to be a holding company. As of September 26, 2020, its sole material asset was a 97.4% economic interest in Summit Materials Holdings L.P., a Delaware limited partnership (“Summit Holdings”). Summit Inc. has 100% of the voting rights of Summit Holdings, which is the indirect parent of Summit LLC. Summit LLC is a co-issuer of our outstanding 5 1/8% senior notes due 2025 (“2025 Notes”), our 6 1/2 % senior notes due 2027 (“2027 Notes”) and our 5 1/4% senior notes due 2029 (“2029 Notes” and collectively with the 2025 Notes and the 2027 Notes, the “Senior Notes”). Summit Inc.’s only revenue for the three and nine months ended September 26, 2020 was that generated by Summit LLC and its consolidated subsidiaries. Summit Inc. controls all of the business and affairs of Summit Holdings and, in turn, Summit LLC.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

 

    This report includes “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations or intentions. All statements made relating to our estimated and projected earnings, margins, costs, expenditures, cash flows, growth rates and financial results are forward-looking statements. These forward-looking statements are subject to risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by such forward-looking statements. We derive many of our forward-looking statements from our operating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the effect of known factors, and, of course, it is impossible to anticipate all factors that could affect our actual results. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be realized. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled “Risk Factors” in Summit Inc.’s Annual Report on Form 10-K for the fiscal year ended December 28, 2019 (the “Annual Report”), and Quarterly Report on Form 10-Q for the fiscal period ended March 28, 2020, each as filed with the Securities and Exchange Commission (the “SEC”), any factors discussed in the section entitled “Risk Factors” of this report and the following:

•the impact of the coronavirus (“COVID-19”) pandemic, or any similar crisis, on our business;

•our dependence on the construction industry and the strength of the local economies in which we operate;

•the cyclical nature of our business;

•risks related to weather and seasonality;

•risks associated with our capital-intensive business;

•competition within our local markets;

•our ability to execute on our acquisition strategy, successfully integrate acquisitions with our existing operations and retain key employees of acquired businesses;

•our dependence on securing and permitting aggregate reserves in strategically located areas;

•declines in public infrastructure construction and delays or reductions in governmental funding, including the funding by transportation authorities and other state agencies;

•our reliance on private investment in infrastructure, which may be adversely affected by periods of economic stagnation and recession;

•environmental, health, safety and climate change laws or governmental requirements or policies concerning zoning and land use;

•costs associated with pending and future litigation;

•rising prices for commodities, labor and other production and delivery inputs as a result of inflation or otherwise;

•conditions in the credit markets;

•our ability to accurately estimate the overall risks, requirements or costs when we bid on or negotiate contracts that are ultimately awarded to us;

•material costs and losses as a result of claims that our products do not meet regulatory requirements or contractual specifications;

•cancellation of a significant number of contracts or our disqualification from bidding for new contracts;

•special hazards related to our operations that may cause personal injury or property damage not covered by insurance;

•unexpected factors affecting self-insurance claims and reserve estimates;

•our substantial current level of indebtedness, including our exposure to variable interest rate risk;

•our dependence on senior management and other key personnel, and our ability to retain and attract other qualified personnel;

•supply constraints or significant price fluctuations in the electricity and petroleum-based resources that we use, including diesel and liquid asphalt;

•climate change and climate change legislation or regulations;

•unexpected operational difficulties;

•interruptions in our information technology systems and infrastructure, including cybersecurity and data leakage risks; and

•potential labor disputes, strikes, other forms of work stoppage or other union activities.

    All subsequent written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by these cautionary statements.

 

    Any forward-looking statement that we make herein speaks only as of the date of this report. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as required by law.

 CERTAIN DEFINITIONS

 

    As used in this report, unless otherwise noted or the context otherwise requires:

 

•“EBITDA” refers to net income (loss) before interest expense (income), income tax expense (benefit) and depreciation, depletion and amortization;

•“Finance Corp.” refers to Summit Materials Finance Corp., an indirect wholly-owned subsidiary of Summit LLC and the co-issuer of the Senior Notes;

•“Issuers” refers to Summit LLC and Finance Corp. as co‑issuers of the Senior Notes;  

•“LP Units” refers to the Class A limited partnership units of Summit Holdings; and

•“TRA” refers to tax receivable agreement between Summit Inc. and certain current and former holders of LP Units and their permitted assignees.

Corporate Structure

    The following chart summarizes our organizational structure, equity ownership and our principal indebtedness as of September 26, 2020. This chart is provided for illustrative purposes only and does not show all of our legal entities or all obligations of such entities.

(1)SEC registrant.

(2)The shares of Class B Common Stock are currently held by pre-IPO investors, including certain members of management or their family trusts that directly hold LP Units.  A holder of Class B Common Stock is entitled, without regard to the number of shares of Class B Common Stock held by such holder, to a number of votes that is equal to the aggregate number of LP Units held by such holder.

(3)Guarantor under the senior secured credit facilities, but not the Senior Notes.

(4)Summit LLC and Finance Corp are the issuers of the Senior Notes and Summit LLC is the borrower under our senior secured credit facilities. Finance Corp. was formed solely for the purpose of serving as co-issuer or guarantor of certain indebtedness, including the Senior Notes. Finance Corp. does not and will not have operations of any kind and does not and will not have revenue or assets other than as may be incidental to its activities as a co-issuer or guarantor of certain indebtedness.

SUMMIT MATERIALS, INC.

SUMMIT MATERIALS, LLC 

FORM 10-Q 

TABLE OF CONTENTS  

						Page No.
PART I—Financial Information
Item 1.			Financial Statements for Summit Materials, Inc.			1
			Consolidated Balance Sheets as of September 26, 2020 (unaudited) and December 28, 2019			1
			Unaudited Consolidated Statements of Operations for the three and nine months ended September 26, 2020 and September 28, 2019			2
			Unaudited Consolidated Statements of Comprehensive Income for the three and nine months ended September 26, 2020 and September 28, 2019			3
			Unaudited Consolidated Statements of Cash Flows for the nine months ended September 26, 2020 and September 28, 2019			4
			Unaudited Consolidated Statements of Changes in Stockholders’ Equity for the three and nine months ended September 26, 2020 and September 28, 2019			5
			Notes to Unaudited Consolidated Financial Statements			7
			Financial Statements for Summit Materials, LLC			22
Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations			22
Item 3.			Quantitative and Qualitative Disclosures About Market Risk			40
Item 4.			Controls and Procedures			40
PART II — Other Information
Item 1.			Legal Proceedings			41
Item 1A.			Risk Factors			41
Item 2.			Unregistered Sales of Equity Securities and Use of Proceeds			41
Item 3.			Defaults Upon Senior Securities			41
Item 4.			Mine Safety Disclosures			41
Item 5.			Other Information			41
Item 6.			Exhibits			42
SIGNATURES						44