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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]      
Amount computed at U.S. statutory federal tax rate $ 26,118 $ 25,476 $ 22,088
State income taxes, net of federal tax benefits 327 397 578
Effect of foreign operations (4,277) (4,382) (3,221)
Benefit from qualified domestic production deduction (1,295) (1,190) (1,131)
Other 819 (140) (11)
Provision for income taxes $ 21,692 $ 20,161 $ 18,303