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Net Earnings Per Share (Schedule Of Computation Of Basic And Diluted Net Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Net Earnings Per Share [Abstract]        
Net earnings $ 10,952 $ 9,644 $ 16,837 $ 12,459
Weighted average shares outstanding 10,677 10,709 10,657 10,997
Diluted effect of stock awards 28 23 25 22
Weighted average shares outstanding assuming dilution 10,705 10,732 10,682 11,019
Basic net earnings per share $ 1.03 $ 0.90 $ 1.58 $ 1.13
Diluted net earnings per share $ 1.02 $ 0.90 $ 1.58 $ 1.13