Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Income Statement [Abstract]
Net revenues	$ 532,411	$ 484,675	$ 1,461,798	$ 1,284,695
Cost of goods sold	341,661	304,302	933,367	812,064
Gross profit	190,750	180,373	528,431	472,631
Selling, general and administrative expenses	145,874	143,685	410,103	382,230
Income from operations	44,876	36,688	118,328	90,401
Interest expense	11,003	5,210	24,058	11,612
Income before income taxes	33,873	31,478	94,270	78,789
Income tax expense	13,163	12,049	36,469	30,312
Net income	$ 20,710	$ 19,429	$ 57,801	$ 48,477
Weighted-average shares used in computing basic net income per share	40,282,734	39,507,272	40,080,843	39,260,458
Basic net income per share	$ 0.51	$ 0.49	$ 1.44	$ 1.23
Weighted-average shares used in computing diluted net income per share	42,413,657	41,392,831	42,237,967	40,954,249
Diluted net income per share	$ 0.49	$ 0.47	$ 1.37	$ 1.18