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, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Earnings Per Share [Abstract]
Net earnings	$ 16,881	$ 25,073	$ 53,150	$ 47,540
Weighted average shares outstanding	11,008	10,978	11,001	10,960
Diluted effect of stock awards	44	43	62	60
Weighted average shares outstanding assuming dilution	11,052	11,021	11,063	11,020
Basic net earnings per share	$ 1.53	$ 2.28	$ 4.83	$ 4.34
Diluted net earnings per share	$ 1.53	$ 2.28	$ 4.80	$ 4.31