Consolidated Statement of Shareholders' Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Adjustment	Common Stock	Treasury Stock	Paid-In Capital	Retained Earnings	Retained Earnings Adjustment
Balance (in shares) at Aug. 28, 2019			30,478	(500)
Balance at Aug. 28, 2019	$ 101,030	$ 1,027	$ 9,753	$ (4,775)	$ 34,870	$ 61,182	$ 1,027
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (8,338)					(8,338)
Accounting standards update	us-gaap:AccountingStandardsUpdate201409Member
Share-based compensation expense (in shares)			58
Share-based compensation expense	$ 366		$ 19		347
Common stock issued under employee benefit plans (in shares)			45
Common stock issued under employee benefit plans	(36)		$ 15		(51)
Common stock issued under nonemployee benefit plans (in shares)			64
Common stock issued under nonemployee benefit plans	0		$ 20		(20)
Balance (in shares) at Dec. 18, 2019			30,645	(500)
Balance at Dec. 18, 2019	94,049		$ 9,807	$ (4,775)	35,146	53,871
Balance (in shares) at Aug. 28, 2019			30,478	(500)
Balance at Aug. 28, 2019	101,030	$ 1,027	$ 9,753	$ (4,775)	34,870	61,182	$ 1,027
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12,141)
Balance (in shares) at Mar. 11, 2020			30,752	(500)
Balance at Mar. 11, 2020	90,612		$ 9,841	$ (4,775)	35,478	50,068
Balance (in shares) at Dec. 18, 2019			30,645	(500)
Balance at Dec. 18, 2019	94,049		$ 9,807	$ (4,775)	35,146	53,871
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,803)					(3,803)
Share-based compensation expense (in shares)			101
Share-based compensation expense	366		$ 32		334
Common stock issued under employee benefit plans (in shares)			6
Common stock issued under employee benefit plans	0		$ 2		(2)
Balance (in shares) at Mar. 11, 2020			30,752	(500)
Balance at Mar. 11, 2020	90,612		$ 9,841	$ (4,775)	35,478	50,068
Balance (in shares) at Aug. 26, 2020			31,124	500
Balance at Aug. 26, 2020	73,599		$ 9,960	$ (4,775)	35,655	32,759
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,019)					(3,019)
Share-based compensation expense (in shares)			51
Share-based compensation expense	183		$ 16		167
Common stock issued under employee benefit plans (in shares)			4
Common stock issued under employee benefit plans	0		$ 1		(1)
Balance (in shares) at Nov. 18, 2020			31,179	500
Balance at Nov. 18, 2020	$ 70,763		$ 9,977	$ (4,775)	$ 35,821	$ 29,740