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, 2021	Aug. 31, 2020	Aug. 31, 2019
Earnings Per Share [Abstract]
Net earnings	$ 42,572	$ 38,629	$ 2,172
Weighted average shares outstanding	10,886	10,823	10,781
Diluted effect of stock equivalents	99	38	29
Weighted average shares outstanding assuming dilution	10,985	10,861	10,810
Basic net earnings per share	$ 3.91	$ 3.57	$ 0.20
Diluted net earnings per share	$ 3.88	$ 3.56	$ 0.20