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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 | 6 Months Ended
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Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Foreign currency losses | $ 57,100 | $ 41,700 | $ 52,600 | $ 35,500
Forward foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain Recognized in Net Income on Derivatives | $ 49,794 | $ 48,933 | $ 42,808 | $ 45,744

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