Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Derivative [Line Items]
Revenue	$ 295,622	$ 623,848	$ 698,611	$ 1,393,207
Cost of revenue	277,951	537,512	640,269	1,214,682
Interest and foreign exchange	9,568	12,609	20,671	25,461
Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	(377)	67	(623)	(99)
Cost of Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	(8)	73	(49)	(2)
Interest and Foreign Exchange
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ (1,263)	$ (369)	$ (2,594)	$ (536)