Summary of Significant Accounting Policies (Details 6) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Aug. 01, 2015	Jan. 31, 2015
Shares
Outstanding at the beginning of the period (in shares)	1,185,767
Granted (in shares)	335,000
Exercised/cancellations for net settlements (in shares)	(261,097)
Expired/forfeited (in shares)	(146,667)
Outstanding at the end of the period (in shares)	1,113,003	1,185,767
Vested and Exercisable at the end of the period (in shares)	550,161
Weighted Average Price
Outstanding at the beginning of the period (in dollars per share)	$ 15.89
Granted (in dollars per share)	22.79
Exercised (in dollars per share)	17.06
Canceled/forfeited (in dollars per share)	17.33
Outstanding at the end of the period (in dollars per share)	17.50	$ 15.89
Vested and Exercisable at the end of the period (in dollars per share)	$ 15.50
Weighted Average Remaining Contractual Term (in years)
Outstanding	4 years 6 months 22 days	3 years 5 months 27 days
Vested and Exercisable at the end of the period	3 years 2 months 5 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 11,159	$ 2,910
Vested and Exercisable at the end of the period (in dollars)	6,616
Unrecognized stock-based compensation
Unrecognized stock-based compensation expense (in dollars)	$ 2,665
Weighted average period for recognition of unrecognized stock-based compensation expense	2 years 5 months 23 days
Total fair value of vested options (in dollars)	$ 603