Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	May 05, 2018	Apr. 29, 2017
Earnings per Common Share [Abstract]
Net income	$ 30,454	$ 18,966
Weighted average number of common shares outstanding - Basic (in shares)	62,169,000	60,880,000
Incremental shares from the assumed exercise of outstanding stock options and vesting of restricted stock units (in shares)	3,455,000	3,509,000
Weighted average number of common shares outstanding - Diluted (in shares)	65,624,000	64,389,000
Earnings per common share - Basic (in dollars per share)	$ 0.49	$ 0.31
Earnings per common share - Diluted (in dollars per share)	$ 0.46	$ 0.29
Stock Options [Member]
Earnings per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	124,738	195,626
Non-vested Restricted Stock Units [Member]
Earnings per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	26,333	0