UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

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FORM 10-K

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For the fiscal year ended June 30, 2017 .

OR

For the transition period from                      to                     

Commission file number: 0-27544

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Registrant's telephone number, including area code: (519) 888-7111

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

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

None

(Title of Class)

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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   ý     No   ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.   Yes   ¨    No   ý

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.    Yes   ý     No   ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulations S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes   ý     No   ¨

Indicate by check mark if disclosure of delinquent filers pursuant to item 405 of Regulations S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ý

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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.

Large accelerated filer   ý      Accelerated filer   ¨      Non-accelerated filer   ¨ (Do not check if smaller reporting company)            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).    Yes   ¨     No   x

Aggregate market value of the Registrant's Common Shares held by non-affiliates, based on the closing price of the Common Shares as reported by the NASDAQ Global Select Market (“NASDAQ”) on December 31, 2016, the end of the registrant's most recently completed second fiscal quarter, was approximately $8.0 billion . The number of the Registrant's Common Shares outstanding as of July 31, 2017 was 264,240,802 .

DOCUMENTS INCORPORATED BY REFERENCE

None.

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