Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 29, 2018	Aug. 30, 2017	Aug. 31, 2016	Aug. 27, 2014	Aug. 26, 2015
Shares Under Fixed Options
Beginning balance (in shares)	1,345,916	1,169,238	1,288,099
Granted (in shares)	449,410	295,869	279,944
Exercised (in shares)			(21,249)
Canceled (in shares)		(9,290)
Forfeited (in shares)	(97,111)	(55,893)	(55,893)
Expired (in shares)	(44,801)	(37,689)	(9,000)
Ending balance (in shares)	1,653,414	1,345,916	1,169,238
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 4.64	$ 4.76	$ 4.76
Granted (in dollars per share)	2.82	4.26	4.89
Exercised (in dollars per share)			3.51
Cancelled (in dollars per share)		4.49
Forfeited (in dollars per share)	4.02	4.80	4.80
Expired (in dollars per share)	7.89	5.39	3.44
Ending balance (in dollars per share)	$ 4.10	$ 4.64	$ 4.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term	6 years 6 months 12 days	6 years 5 months 8 days	6 years 6 months 23 days	6 years 6 months
Aggregate Intrinsic value (in dollars)	$ 0	$ 0	$ 178		$ 350
Exercisable (in shares)	1,066,103
Exercisable, Weighted-average exercise price (in dollars per share)	$ 4.53
Exercisable, Weighted-average remaining contractual term	5 years 2 months 12 days
Exercisable, Aggregate Intrinsic value (in dollars)	$ 0