Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Allowance for credit losses / doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,593	$ 1,569	$ 2,586
Charged to Cost and Expense	0	66	74
Deductions	(27)	(42)	(1,091)
Balance at End of Period	1,566	1,593	1,569
Deferred tax valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	16,933	16,436	16,484
Charged to Cost and Expense	482	1,293	472
Deductions	(2,893)	(796)	(520)
Balance at End of Period	$ 14,522	$ 16,933	$ 16,436