Income (Loss) Per Common Share (Computations Of Basic And Diluted Income (Loss) Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Numerator:
Net income	$ 33,313	$ 3,311	$ 8,320	$ 3,080	$ 24,826	$ 1,677	$ 4,069	$ 1,570	$ 48,024	$ 32,142	$ 20,025
Dividend paid to preferred shareholders									0	0	(62,504)
Dividend paid to unvested restricted shareholders									0	0	(2,899)
Net income attributable to participating securities									(20)	(465)	0
Net income (loss) attributable to common shareholders									$ 48,004	$ 31,677	$ (45,378)
Denominator:
Weighted-average common shares outstanding - basic (shares)									54,219,801	53,294,805	35,444,200
Dilutive impact of options and warrants (shares)									354,054	447,055	0
Weighted average common share outstanding - diluted (shares)									54,573,855	53,741,860	35,444,200
Per common share:
Basic income (loss) per common share (dollars per share)	$ 0.61	$ 0.06	$ 0.15	$ 0.06	$ 0.46	$ 0.03	$ 0.08	$ 0.03	$ 0.89	$ 0.59	$ (1.28)
Diluted income (loss) per common share (dollars per share)	$ 0.61	$ 0.06	$ 0.15	$ 0.06	$ 0.45	$ 0.03	$ 0.07	$ 0.03	$ 0.88	$ 0.59	$ (1.28)