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. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Earnings Per Share [Abstract]
Net earnings (loss)	$ 5,516	$ (3,440)	$ 13,861	$ (2,228)
Weighted average shares outstanding	10,825	10,786	10,810	10,776
Diluted effect of stock awards	32	0	33	0
Weighted average shares outstanding assuming dilution	10,857	10,786	10,843	10,776
Basic net earnings (loss) per share	$ 0.51	$ (0.32)	$ 1.28	$ (0.21)
Diluted net earnings (loss) per share	$ 0.51	$ (0.32)	$ 1.28	$ (0.21)