Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Income Statement [Abstract]
Net revenues	$ 506,942	$ 433,766	$ 929,387	$ 800,020
Cost of goods sold	312,679	265,857	591,706	507,762
Gross profit	194,263	167,909	337,681	292,258
Selling, general and administrative expenses	137,840	118,974	264,229	238,545
Income from operations	56,423	48,935	73,452	53,713
Interest expense	7,406	4,346	13,055	6,402
Income before income taxes	49,017	44,589	60,397	47,311
Income tax expense	19,082	17,336	23,306	18,263
Net income	$ 29,935	$ 27,253	$ 37,091	$ 29,048
Weighted-average shares used in computing basic net income per share	40,045,850	39,436,255	39,979,898	39,294,274
Basic net income per share	$ 0.75	$ 0.69	$ 0.93	$ 0.74
Weighted-average shares used in computing diluted net income per share	42,243,910	41,262,629	42,117,215	40,965,628
Diluted net income per share	$ 0.71	$ 0.66	$ 0.88	$ 0.71