Related Party Transactions - Additional Information (Detail) - Merchandise Inventory Purchase [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Related Party Transaction [Line Items]
Purchase from related party vendor as percentage of total merchandise purchases	13.50%	11.60%	13.20%	11.80%
Vendor [Member]
Related Party Transaction [Line Items]
Purchase from related party vendor	$ 8.2	$ 6.3	$ 15.2	$ 12.0
Cost of sale related to vendor	6.8	5.7	13.2	11.5
Payable amounts outstanding to vendor	$ 2.2	$ 1.7	$ 2.2	$ 1.7