Income (Loss) Per Common Share (Computations Of Basic And Diluted Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Numerator:
Net income	$ 9,879	$ 5,447	$ 35,074	$ 22,052
Denominator:
Weighted-average common shares outstanding - basic (shares)	55,215,850	54,871,172	55,148,316	54,809,768
Dilutive impact of options and warrants (shares)	392,185	299,514	345,136	290,766
Weighted average common share outstanding - diluted (shares)	55,608,035	55,170,686	55,493,452	55,100,534
Per common share:
Basic income (loss) per common share (dollars per share)	$ 0.18	$ 0.10	$ 0.64	$ 0.40
Diluted income (loss) per common share (dollars per share)	$ 0.18	$ 0.10	$ 0.63	$ 0.40