Derivative Instruments - Schedule Of Effects Of Cash Flow Hedges Included In Statement Of Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Derivative [Line Items]
Revenues	$ 769,359	$ 604,523
Cost of revenue	677,170	531,990
Interest and foreign exchange	12,852	4,404
Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	(166)	(256)
Cost of Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	(75)	(232)
Interest and Foreign Exchange
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ (167)	$ (144)