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Derivative Financial Instruments and Hedging Activities (Foreign Currency Risk Management) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Aug. 31, 2018 | Aug. 31, 2017
Cost of revenue |  |
Derivative [Line Items] |  |
Foreign currency losses | $ 29.6 |
Forward foreign exchange contracts | Cost of revenue |  |
Derivative [Line Items] |  |
Gain recognized due to changes in fair value of derivatives | 48.7 |
Forward contracts | Cash flow hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount | 3,400.0 | $ 2,100.0
Forward contracts | Forward foreign exchange contracts |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 293.4 | $ 314.6

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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 Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 + Details
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