Revenue Recognition - Summary of Contract Balances (Detail) - USD ($) $ in Thousands		6 Months Ended
		Feb. 28, 2021	Aug. 31, 2020
Contract With Customer Asset And Liability [Line Items]
Contract liabilities	[1]	$ 34,824	$ 27,009
Change in contract liabilities	[1]	7,815
Accounts Receivable, Net
Contract With Customer Asset And Liability [Line Items]
Contract assets		26,954	430
Change in contract assets		26,524
Inventories
Contract With Customer Asset And Liability [Line Items]
Contract assets		9,137	$ 7,081
Change in contract assets		$ 2,056

[1] Contract liabilities balance includes deferred revenue within the scope of Topic 606.