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Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings (Loss) from Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Segment Reporting [Abstract]
Earnings (loss) from operations	$ 40,970	$ 168,429	$ 184,116
Interest and foreign exchange	43,263	43,619	30,912
Net loss on extinguishment of debt	6,287
Earnings (loss) before income tax and earnings (loss) from unconsolidated affiliates	$ (8,580)	$ 124,810	$ 153,204

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