Earnings Per Share - Components of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Aug. 29, 2018	Jun. 06, 2018	Mar. 14, 2018	Aug. 30, 2017	Jun. 07, 2017	Mar. 15, 2017	Dec. 20, 2017	Dec. 21, 2016	Aug. 29, 2018	Aug. 30, 2017	Aug. 31, 2016
Numerator:
Loss from continuing operations	$ (1,858)	$ (14,133)	$ (11,461)	$ (4,069)	$ (377)	$ (12,836)	$ (5,502)	$ (5,514)	$ (32,954)	$ (22,796)	$ (10,256)
NET LOSS	$ (1,864)	$ (14,596)	$ (11,571)	$ (4,101)	$ (396)	$ (13,179)	$ (5,537)	$ (5,586)	$ (33,568)	$ (23,262)	$ (10,346)
Denominator:
Denominator for basic earnings per share—weighted-average shares (in shares)									29,901	29,476	29,226
Effect of potentially dilutive securities:
Employee and non-employee stock options (in shares)									0	0	0
Denominator for earnings per share assuming dilution (in shares)									29,901	29,476	29,226
Loss from continuing operations:
Basic (in dollars per share)									$ (1.10)	$ (0.77)	$ (0.35)
Assuming dilution (in dollars per share)									(1.10)	(0.77)	(0.35)
Net loss per share:
Basic (in dollars per share)	$ (0.06)	$ (0.48)	$ (0.39)	$ (0.14)	$ (0.01)	$ (0.45)	$ (0.19)	$ (0.19)	(1.12)	(0.79)	(0.35)
Assuming dilution (in dollars per share)	$ (0.06)	$ (0.48)	$ (0.39)	$ (0.14)	$ (0.01)	$ (0.45)	$ (0.19)	$ (0.19)	$ (1.12)	$ (0.79)	$ (0.35)
Potentially dilutive shares not included in the computation of net income per share (in shares)									0	3	55
Stock options
Net loss per share:
Potentially dilutive shares not included in the computation of net income per share (in shares)									1,653	1,346	494