Lease Commitments - Components of Operating Lease Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Leases [Abstract]
Operating lease expense	$ 13,222	$ 15,256
Short-term lease expense	5,252	8,313
Total	$ 18,474	$ 23,569