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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

X

- 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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X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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