Consolidated Statement of Shareholders' Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Paid-In Capital	Retained Earnings
Balance (in shares) at Aug. 30, 2017		29,624	(500)
Balance at Aug. 30, 2017	$ 144,052	$ 9,480	$ (4,775)	$ 31,850	$ 107,497
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,537)				(5,537)
Share-based compensation expense (in shares)		30
Share-based compensation expense	867	$ 10		857
Common stock issued under employee benefit plans (in shares)		163
Common stock issued under employee benefit plans	0	$ 52		(52)
Balance (in shares) at Dec. 20, 2017		29,817	(500)
Balance at Dec. 20, 2017	139,382	$ 9,542	$ (4,775)	32,655	101,960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes from the adoption of ASC Topic 606	2,479				2,479
Balance (in shares) at Aug. 29, 2018		30,003	(500)
Balance at Aug. 29, 2018	112,628	$ 9,602	$ (4,775)	33,872	73,929
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,489)				(7,489)
Share-based compensation expense (in shares)		42
Share-based compensation expense	439	$ 13		426
Common stock issued under employee benefit plans (in shares)		81
Common stock issued under employee benefit plans	0	$ 26		(26)
Common stock issued under nonemployee benefit plans (in shares)		38
Common stock issued under nonemployee benefit plans	0	$ 12		(12)
Balance (in shares) at Dec. 19, 2018		30,164	(500)
Balance at Dec. 19, 2018	$ 108,057	$ 9,653	$ (4,775)	$ 34,260	$ 68,919