Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,586	$ 2,280	$ 2,315
Charges to Cost and Expenses	74	323	126
Deductions	(1,091)	(17)	(161)
Balance at End of Period	1,569	2,586	2,280
Deferred tax valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	16,484	67,348	83,891
Charges to Cost and Expenses	472	0	690
Deductions	(520)	(50,864)	(17,233)
Balance at End of Period	$ 16,436	$ 16,484	$ 67,348