Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Income Taxes [Line Items]
Valuation allowance, tax credit carryforward		$ 9,150
Operating loss carryforwards		23,954
Valuation allowance, deferred income tax assets		15,076	$ 3,815	$ 3,397	$ 612
Partially offset by reversal valuation allowance		(11,261)	(418)	(2,780)
Increase in income tax expense		11,300
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate		1,300	1,600
Unrecognized tax benefits		1,640	1,895	$ 2,111	$ 2,359
Balance of interest and penalties related to uncertain tax positions		$ 200	$ 200
Federal statutory income tax rate		(21.00%)	(21.00%)	25.70%
Income tax expense under GILTI provisions		$ 0	$ 300
Income tax expense from effects of 2017 Tax Act				$ (1,654)
Income tax benefits including one-time benefit from enactment				1,700
One-time benefit from enactment				900
One-time benefit from re-measuring net deferred tax liabilities				800
One-time benefit from other enactment changes				200
Income tax expense from repatriation of foreign earnings				100
Income tax benefit from exercise of stock option		1,800
Income tax expense for compensation deductions less than book expense			100
Operating loss carryforwards		33,812
Forecast [Member]
Income Taxes [Line Items]
Expect decrease in unrecognized tax benefit	$ (100)
2017 Tax Act [Member]
Income Taxes [Line Items]
Income tax expense from effects of 2017 Tax Act		200	$ (100)
Foreign [Member]
Income Taxes [Line Items]
Valuation allowance, tax credit carryforward				$ 3,000
United States - State And Local Income Tax [Member]
Income Taxes [Line Items]
Operating loss carryforwards		$ 1,600