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Income Taxes (Schedule Of Effective income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Taxes [Abstract]
U.S statutory rate	$ 12,500	$ 10,251	$ 16,363
State and local taxes, net of federal tax benefit	480	350	911
Foreign tax rate differences	(486)	(195)	1,478
Domestic production activities deduction	(700)	(960)	(1,548)
Deferred tax asset valuation allowance			2,949
Other	742	(425)	289
Total income tax provision	$ 12,536	$ 9,021	$ 20,442
U.S statutory rate, percentage	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit, percentage	1.30%	1.20%	1.90%
Foreign tax rate differences, percentage	(1.40%)	(0.70%)	3.20%
Domestic production activities deduction, percentage	(2.00%)	(3.30%)	(3.30%)
Deferred tax asset valuation allowance, percentage			6.30%
Other, percentage	2.20%	(1.40%)	0.60%
Effective rate, percentage	35.10%	30.80%	43.70%

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