Income Per Common Share (Computations Of Basic And Diluted Income (Loss) Per Share) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Numerator:
Net income	$ 49,788,000	$ 5,447,000	$ 9,847,000	$ 6,758,000	$ 42,004,000	$ 4,337,000	$ 7,061,000	$ 4,278,000	$ 71,840,000	$ 57,680,000	$ 48,024,000
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted									0	0	20,000
Net income attributable to common shareholders									$ 71,840,000	$ 57,680,000	$ 48,004,000
Denominator:
Weighted-average common shares outstanding - basic (shares)									54,845,708	54,513,622	54,219,801
Dilutive impact of options and warrants (shares)									283,162	279,679	354,054
Weighted average common share outstanding - diluted (shares)									55,128,870	54,793,301	54,573,855
Per common share:
Basic income (loss) per common share (dollars per share)	$ 0.91	$ 0.10	$ 0.18	$ 0.12	$ 0.77	$ 0.08	$ 0.13	$ 0.08	$ 1.31	$ 1.06	$ 0.89
Diluted income (loss) per common share (dollars per share)	$ 0.90	$ 0.10	$ 0.18	$ 0.12	$ 0.77	$ 0.08	$ 0.13	$ 0.08	$ 1.30	$ 1.05	$ 0.88