Consolidated Statement of Shareholders' Equity (unaudited) - 6 months ended Mar. 15, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance (in shares) at Aug. 31, 2016		29,440	(500)
Balance at Aug. 31, 2016	$ 165,753	$ 9,421	$ (4,775)	$ 30,348	$ 130,759
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(18,765)				(18,765)
Share-based compensation expense (in shares)		41
Share-based compensation expense	870	$ 13		857
Common stock issued under employee benefit plans (in shares)		3
Common stock issued under employee benefit plans	0	$ 1		(1)
Common stock issued under nonemployee benefit plans (in shares)		83
Common stock issued under nonemployee benefit plans	0	$ 26		(26)
Balance (in shares) at Mar. 15, 2017		29,567	(500)
Balance at Mar. 15, 2017	$ 147,858	$ 9,461	$ (4,775)	$ 31,178	$ 111,994