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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Income Taxes [Abstract]
Amount computed at U.S. statutory federal tax rate	$ 16,962	$ 19,298	$ 26,118
State income taxes, net of federal tax benefits	963	453	327
Effect of foreign operations	(1,086)	(1,412)	(4,277)
Benefit from qualified domestic production deduction		(1,121)	(1,295)
Remeasurement of deferred income taxes		(6,762)
Toll tax, net of foreign tax credits	8,665	(282)
Benefit from stock compensation	(1,107)	(725)
Other	465	514	819
Provision for income taxes	$ 24,862	$ 9,963	$ 21,692

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