Income Taxes (Schedule of Effective income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Income Tax Disclosure [Abstract]
U.S. statutory rate	$ 10,581	$ 10,257	$ 443
State and local taxes, net of federal tax benefit	859	1,079	(379)
Foreign tax rate differences	(390)	(292)	164
U.S. tax reform	339	(165)	160
Deferred tax asset valuation allowance	(2,169)	(479)	142
Federal credits	(629)	(419)	(338)
Uncertain tax benefits	(622)	165	(153)
Other	(155)	68	(104)
Total income tax provision	$ 7,814	$ 10,214	$ (65)
U.S statutory rate, percentage	21.00%	21.00%	21.00%
State and local taxes, net of federal tax benefit, percentage	1.70%	2.20%	(18.00%)
Foreign tax rate differences, percentage	(0.80%)	(0.60%)	7.80%
U.S. tax reform, percentage	0.70%	(0.30%)	7.60%
Deferred tax asset valuation allowance, percentage	(4.30%)	(1.00%)	6.70%
Federal Credits, percentage	(1.20%)	(0.90%)	(16.00%)
Uncertain Tax Benefits, percentage	(1.20%)	0.30%	(7.30%)
Other, percentage	(0.40%)	0.10%	(4.90%)
Effective rate, percentage	15.50%	20.90%	(3.10%)