Share-Based Compensation - Stock Option Activity Under Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Stock options
Beginning balance (in shares)	1,842,375
Granted (in shares)	411,000
Exercised (in shares)	(308,250)
Forfeited (in shares)	(59,000)
Expired (in shares)	(34,875)
Ending balance (in shares)	1,851,250	1,842,375
Vested and expected to vest ending balance (in shares)	1,851,250
Exercisable ending balance (in shares)	828,250
Grant date weighted average exercise price
Grant date weighted average exercise price, Beginning balance (in dollars per share)	$ 9.98
Grant date weighted average exercise price, Granted (in dollars per share)	8.79
Grant date weighted average exercise price, Exercised (in dollars per share)	11.01
Grant date weighted average exercise price, Forfeited (in dollars per share)	8.92
Grant date weighted average exercise price, Expired (in dollars per share)	14.07
Grant date weighted average exercise price, Ending balance (in dollars per share)	9.50	$ 9.98
Grant date weighted average exercise price, Vested and expected to vest ending balance (in dollars per share)	9.50
Grant date weighted average exercise price, Exercisable ending balance (in dollars per share)	$ 11.55
Average remaining contractual life
Outstanding at end of period (in years)	7 years 2 months
Vested and expected to vest end of period (in years)	7 years 2 months
Exercisable ending balance (in years)	5 years 7 months
Aggregate intrinsic value
Outstanding at end of period	$ 9,304
Vested and expected to vest ending balance	9,304
Exercisable ending balance	$ 2,738
Class A Common Stock
Stock options
Exercised (in shares)	(308,000)	(215,000)	(336,000)
Aggregate intrinsic value
Market value per share (in dollars per share)	$ 14.27