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		6 Months Ended
	Mar. 14, 2018	Mar. 15, 2017	Mar. 14, 2018	Mar. 15, 2017
Numerator:
Loss from continuing operations	$ (11,074)	$ (12,836)	$ (15,941)	$ (18,350)
Loss from discontinued operations, net of income taxes	(111)	(343)	(146)	(415)
NET LOSS	$ (11,185)	$ (13,179)	$ (16,087)	$ (18,765)
Denominator:
Denominator for basic earnings per share—weighted-average shares (in shares)	29,950	29,522	29,802	29,418
Effect of potentially dilutive securities:
Employee and non-employee stock options (in shares)	0	0	0	0
Denominator for earnings per share assuming dilution (in shares)	29,950	29,522	29,802	29,418
Loss per share from continuing operations:
Basic (in dollars per share)	$ (0.37)	$ (0.44)	$ (0.53)	$ (0.62)
Assuming dilution (in dollars per share)	(0.37)	(0.44)	(0.53)	(0.62)
Loss per share from discontinued operations:
Basic (in dollars per share)	0.00	(0.01)	(0.01)	(0.02)
Assuming dilution (in dollars per share)	0.00	(0.01)	(0.01)	(0.02)
Net loss per share:
Basic (in dollars per share)	(0.37)	(0.45)	(0.54)	(0.64)
Assuming dilution (in dollars per share)	$ (0.37)	$ (0.45)	$ (0.54)	$ (0.64)