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Derivative Financial Instruments and Hedging Activities (Additional Information) (Details 1) - USD ($) | 12 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016
Forward contracts | Cash flow hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 2,100,000,000 | $ 1,700,000,000
Forward contracts | Forward foreign exchange contracts |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 314,600,000 | $ 323,300,000
8.250% Senior Notes |  |
Derivative [Line Items] |  |
Senior unsecured notes, interest rate | 8.25% |
Expiry date | Mar. 15, 2018 |
8.250% Senior Notes | Interest rate swap | Cash flow hedging |  |
Derivative [Line Items] |  |
Expiry date | Mar. 15, 2018 |
Anticipated debt issuance [Member] | Cash flow hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 200,000,000 |
Expiry date | Mar. 15, 2018 |
Term loan facility [Member] | Cash flow hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 200,000,000 |
Expiry date | Jun. 30, 2019 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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