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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Income Taxes [Abstract]      
Amount computed at U.S. statutory federal tax rate $ 22,088 $ 22,036 $ 19,904
State income taxes, net of federal tax benefits 578 674 661
Effect of foreign operations (3,221) (2,270) (2,353)
Benefit from qualified domestic production deduction (1,131) (1,048) (1,050)
Other (11) (179) (108)
Provision for income taxes $ 18,303 $ 19,213 $ 17,054