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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
	Nov. 30, 2020	Nov. 30, 2019
Earnings Per Share [Abstract]
Net earnings	$ 7,095	$ 8,345
Weighted average shares outstanding	10,845	10,795
Diluted effect of stock awards	43	33
Weighted average shares outstanding assuming dilution	10,888	10,828
Basic net earnings per share	$ 0.65	$ 0.77
Diluted net earnings per share	$ 0.65	$ 0.77

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