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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, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Earnings Per Share [Abstract]        
Net earnings $ 17,797 $ 10,094 $ 36,768 $ 23,955
Weighted average shares outstanding 10,907 10,835 10,879 10,818
Diluted effect of stock awards 126 42 88 36
Weighted average shares outstanding assuming dilution 11,033 10,877 10,967 10,854
Basic net earnings per share $ 1.63 $ 0.93 $ 3.38 $ 2.21
Diluted net earnings per share $ 1.61 $ 0.93 $ 3.35 $ 2.21