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Quarterly Financial Information (Unaudited) - Summarized Quarterly Financial Results (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 178,683us-gaap_SalesRevenueNet	$ 117,198us-gaap_SalesRevenueNet	$ 103,485us-gaap_SalesRevenueNet	$ 108,255us-gaap_SalesRevenueNet	$ 156,073us-gaap_SalesRevenueNet	$ 106,134us-gaap_SalesRevenueNet	$ 97,123us-gaap_SalesRevenueNet	$ 101,233us-gaap_SalesRevenueNet	$ 507,621us-gaap_SalesRevenueNet	$ 460,563us-gaap_SalesRevenueNet	$ 448,365us-gaap_SalesRevenueNet
Gross profit	76,670us-gaap_GrossProfit	45,752us-gaap_GrossProfit	37,873us-gaap_GrossProfit	42,602us-gaap_GrossProfit	64,632us-gaap_GrossProfit	41,135us-gaap_GrossProfit	35,643us-gaap_GrossProfit	39,406us-gaap_GrossProfit	202,897us-gaap_GrossProfit	180,816us-gaap_GrossProfit	168,616us-gaap_GrossProfit
Operating income (loss)	25,182us-gaap_OperatingIncomeLoss	1,971us-gaap_OperatingIncomeLoss	(1,871)us-gaap_OperatingIncomeLoss	3,359us-gaap_OperatingIncomeLoss	20,536us-gaap_OperatingIncomeLoss	1,694us-gaap_OperatingIncomeLoss	(1,074)us-gaap_OperatingIncomeLoss	2,836us-gaap_OperatingIncomeLoss	28,641us-gaap_OperatingIncomeLoss	23,992us-gaap_OperatingIncomeLoss	21,528us-gaap_OperatingIncomeLoss
Net income (loss)	$ 15,554us-gaap_NetIncomeLoss	$ 1,260us-gaap_NetIncomeLoss	$ (1,055)us-gaap_NetIncomeLoss	$ 2,055us-gaap_NetIncomeLoss	$ 12,326us-gaap_NetIncomeLoss	$ 1,008us-gaap_NetIncomeLoss	$ (577)us-gaap_NetIncomeLoss	$ 1,773us-gaap_NetIncomeLoss	$ 17,814us-gaap_NetIncomeLoss	$ 14,530us-gaap_NetIncomeLoss	$ 13,795us-gaap_NetIncomeLoss
Earnings (loss) per share:
Basic	$ 0.91us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 1.03us-gaap_EarningsPerShareBasic	$ 0.84us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic
Diluted	$ 0.87us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted

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