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, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Earnings Per Share [Abstract]
Net earnings	$ 25,073	$ 17,797	$ 47,540	$ 36,768
Weighted average shares outstanding	10,978	10,907	10,960	10,879
Diluted effect of stock awards	43	126	60	88
Weighted average shares outstanding assuming dilution	11,021	11,033	11,020	10,967
Basic net earnings per share	$ 2.28	$ 1.63	$ 4.34	$ 3.38
Diluted net earnings per share	$ 2.28	$ 1.61	$ 4.31	$ 3.35