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, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Earnings Per Share [Abstract]
Net earnings (loss)	$ (3,440)	$ 1,735	$ (2,228)	$ 4,920
Weighted average shares outstanding	10,786	10,743	10,776	10,724
Diluted effect of stock awards	0	22	0	28
Weighted average shares outstanding assuming dilution	10,786	10,765	10,776	10,752
Basic net earnings (loss) per share	$ (0.32)	$ 0.16	$ (0.21)	$ 0.46
Diluted net earnings (loss) per share	$ (0.32)	$ 0.16	$ (0.21)	$ 0.46