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The amount of cash received during the period on settlement of a hedge.

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

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Aggregate gain on all derivative instruments recognized in earnings during the period, before tax effects.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended
	Nov. 30, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2018	Aug. 31, 2016
Interest rate swaps \| Cash flow hedging
Derivative [Line Items]
Aggregate notional amount	$ 200,000,000				$ 350,000,000.0
Forward contracts
Derivative [Line Items]
Aggregate notional amount	3,800,000,000			$ 3,400,000,000
Forward contracts \| Forward foreign exchange contracts \| Cash flow hedging
Derivative [Line Items]
Aggregate notional amount	$ 451,300,000			293,400,000
Term Loan Facility \| Cash flow hedging
Derivative [Line Items]
Aggregate notional amount					200,000,000
Anticipated debt issuance \| Cash flow hedging
Derivative [Line Items]
Aggregate notional amount					$ 200,000,000
Fair value of cash received for settlement of swaps		$ 17,200,000
Senior Notes \| 3.950% Senior Notes
Derivative [Line Items]
Senior Notes, stated interest rate	3.95%
Cost of revenue
Derivative [Line Items]
Foreign currency gains (losses)	$ 21,900,000
Cost of revenue \| Forward foreign exchange contracts
Derivative [Line Items]
Gain recognized due to changes in fair value of derivatives	38,600,000
Term Loan Facility \| Line of Credit \| 2017 Term Loan Facility
Derivative [Line Items]
Maximum borrowing capacity	$ 500,000,000
Term Loan Facility \| Line of Credit \| 2018 Term Loan Facility
Derivative [Line Items]
Maximum borrowing capacity				$ 350,000,000