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, 2019	Nov. 30, 2018
Earnings Per Share [Abstract]
Net earnings	$ 8,345	$ 1,212
Weighted average shares outstanding	10,795	10,766
Diluted effect of stock awards	33	40
Weighted average shares outstanding assuming dilution	10,828	10,806
Basic net earnings per share	$ 0.77	$ 0.11
Diluted net earnings per share	$ 0.77	$ 0.11