Earnings Per Share - Components of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		6 Months Ended	12 Months Ended
	Aug. 26, 2020	Jun. 03, 2020	Mar. 11, 2020	Aug. 28, 2019	Jun. 05, 2019	Mar. 13, 2019	Dec. 18, 2019	Dec. 19, 2018	Mar. 11, 2020	Aug. 26, 2020	Aug. 28, 2019
Numerator:
Loss from continuing operations	$ 7,674	$ (24,972)	$ (3,796)	$ (9,081)	$ (5,295)	$ 6,640	$ (8,327)	$ (7,483)		$ (29,421)	$ (15,219)
Net Loss	$ 7,669	$ (24,979)	$ (3,802)	$ (9,069)	$ (5,301)	$ 6,632	$ (8,338)	$ (7,488)	$ (12,100)	$ (29,450)	$ (15,226)
Denominator:
Denominator for basic earnings per share—weighted-average shares (in shares)										30,294,000	29,786,000
Effect of potentially dilutive securities:
Employee and non-employee stock options (in shares)										0	0
Denominator for earnings per share assuming dilution (in shares)										30,294,000	29,786,000
Loss from continuing operations:
Basic (in dollars per share)										$ (0.97)	$ (0.51)
Assuming dilution (in dollars per share)										(0.97)	(0.51)
Net loss per share:
Basic (in dollars per share)	$ 0.25	$ (0.82)	$ (0.13)	$ (0.30)	$ (0.18)	$ 0.22	$ (0.28)	$ (0.25)		(0.97)	(0.51)
Assuming dilution (in dollars per share)	$ 0.25	$ (0.82)	$ (0.13)	$ (0.30)	$ (0.18)	$ 0.22	$ (0.28)	$ (0.25)		$ (0.97)	$ (0.51)
Potentially dilutive shares not included in the computation of net income per share (in shares)										76,572	63,000
Stock options
Net loss per share:
Potentially dilutive shares not included in the computation of net income per share (in shares)										860,501	1,387,000