Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Accounts receivable reserve
Changes in valuation allowances and reserves
Balance at Beginning of Year	$ 739	$ 559	$ 456
Charges to Operations	921	1,775	1,138
Deductions to Reserves	(1,222)	(1,595)	(1,035)
Balance at End of Year	438	739	559
Warranty reserve
Changes in valuation allowances and reserves
Balance at Beginning of Year	37	0	220
Charges to Operations		37
Deductions to Reserves	(37)		(220)
Balance at End of Year	$ 0	$ 37	$ 0