Derivative Financial Instruments and Hedging Activities - Fair Value of Derivative Instruments Recorded on Consolidated Statements of Operations (Details) - Cost of revenue - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency gain (loss)	$ 28,300	$ 23,100	$ (24,300)	$ (12,500)
Forward foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Net Income on Derivatives	$ (33,476)	$ (19,785)	$ 9,332	$ 25,959

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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