Derivative Instruments - Additional Information (Detail)	6 Months Ended
	Feb. 28, 2019 USD ($)
Foreign Exchange Contracts
Derivative [Line Items]
Aggregate derivative notional amount	$ 106,200,000
Amount reclassified to revenue or cost of revenue in the next year	900,000
Interest rate swap contracts
Derivative [Line Items]
Aggregate derivative notional amount	$ 111,500,000
Maturity date	2023-09
Unrealized pre-tax gain (loss) that would be reclassified to interest expense in the next year	$ 500,000