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	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Earnings Per Share [Abstract]
Net earnings	$ 65,469	$ 42,572	$ 38,629
Weighted average shares outstanding	10,965	10,886	10,823
Diluted effect of stock equivalents	66	99	38
Weighted average shares outstanding assuming dilution	11,031	10,985	10,861
Basic net earnings per share	$ 5.97	$ 3.91	$ 3.57
Diluted net earnings per share	$ 5.94	$ 3.88	$ 3.56