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, 2021	Nov. 30, 2020
Earnings Per Share [Abstract]
Net earnings	$ 7,901	$ 7,095
Weighted average shares outstanding	10,927	10,845
Diluted effect of stock awards	99	43
Weighted average shares outstanding assuming dilution	11,026	10,888
Basic net earnings per share	$ 0.72	$ 0.65
Diluted net earnings per share	$ 0.72	$ 0.65