Stock-Based Compensation - Stock Option Activity under Two Thousand Six Plan (Details) (USD $)	3 Months Ended
	May 02, 2015		May 03, 2014
Number of Shares
Options granted	0		0
Employee Stock Plan, 2006 Plan
Number of Shares
Outstanding options at beginning of year	2,747,802
Options canceled	(13,791)
Options exercised	(12,136)	[1]
Outstanding options at end of quarter	2,721,875
Options exercisable at end of quarter	582,060
Weighted-average exercise price per option
Outstanding options at beginning of year	4.97
Options canceled	5.04
Options exercised	5.04	[1]
Outstanding options at end of quarter	4.97
Options exercisable at end of quarter	4.76
Weighted-average remaining contractual term
Outstanding options at end of quarter	7 years 8 months 12 days
Options exercisable at end of quarter	6 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding options at end of quarter	321,182
Options exercisable at end of quarter	260,516

[1] The intrinsic value of options exercised was immaterial.