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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, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Earnings Per Share [Abstract]
Net earnings	$ 2,897	$ 10,379	$ 669	$ 15,299
Weighted average shares outstanding	10,786	10,757	10,779	10,735
Diluted effect of stock awards	28	28	28	28
Weighted average shares outstanding assuming dilution	10,814	10,785	10,807	10,763
Basic net earnings per share	$ 0.27	$ 0.96	$ 0.06	$ 1.43
Diluted net earnings per share	$ 0.27	$ 0.96	$ 0.06	$ 1.42

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