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		6 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Earnings Per Share [Abstract]
Net earnings	$ 14,566	$ 11,876	$ 22,467	$ 18,971
Weighted average shares outstanding	10,974	10,884	10,950	10,865
Diluted effect of stock awards	40	97	70	69
Weighted average shares outstanding assuming dilution	11,014	10,981	11,020	10,934
Basic net earnings per share	$ 1.33	$ 1.09	$ 2.05	$ 1.75
Diluted net earnings per share	$ 1.32	$ 1.08	$ 2.04	$ 1.74