Derivative Instruments - Additional Information (Detail)	3 Months Ended
	Nov. 30, 2016 USD ($)
Foreign Exchange Contracts
Derivative [Line Items]
Aggregate derivative notional amount	$ 423,400,000
Amount reclassified to revenue or cost of revenue in the next 12 months	7,300,000
Interest rate swap contracts
Derivative [Line Items]
Aggregate derivative notional amount	$ 91,300,000
Maturity date	2020-03
Unrealized pre-tax gain (loss) that would be reclassified to interest expense in the next 12 months	$ 1,300,000