Equity Award Plans - Stock Option Activity for All Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 30, 2016
Stock option activity for all plans
Outstanding Stock Options, beginning balance | shares	454	832
Outstanding Stock Options, granted | shares	544	49
Outstanding Stock Options, exercised | shares	(12)	(11)
Outstanding Stock Options, forfeited | shares	(43)	(125)
Outstanding Stock Options, expired | shares	(111)	(25)
Outstanding Stock Options, ending balance | shares	832	720
Outstanding Stock Options, exercisable | shares		300
Weighted Average Exercise Price, outstanding stock options, beginning balance | $ / shares	$ 19.87	$ 15.97
Weighted Average Exercise Price, outstanding stock options, granted | $ / shares	14.32	14.11
Weighted Average Exercise Price, outstanding stock options, exercised | $ / shares	7.91	6.45
Weighted Average Exercise Price, outstanding stock options, forfeited | $ / shares	23.27	16.12
Weighted Average Stock Price, stock options outstanding, expired | $ / shares	21.94	14.70
Weighted Average Exercise Price, stock options outstanding, ending balance | $ / shares	$ 15.97	16.00
Weighted Average Exercise Price, outstanding stock options, exercisable | $ / shares		$ 16.68
Weighted Average Remaining Life, stock options outstanding, ending balance		8 years 1 month 6 days
Weighted Average Remaining Life, stock options outstanding, exercisable		7 years 1 month 6 days
Aggregate Intrinsic Value, stock options outstanding, ending balance | $		$ 6
Aggregate Intrinsic Value, stock options outstanding, exercisable | $		$ 6