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Related Party Transactions - Additional Information (Detail) - Merchandise Inventory Purchase [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Related Party Transaction [Line Items]        
Purchase from related party vendor as percentage of total merchandise purchases 15.60% 13.00% 14.20% 12.30%
Vendor [Member]        
Related Party Transaction [Line Items]        
Purchase from related party vendor $ 13.2 $ 9.4 $ 28.4 $ 21.4
Cost of sale related to vendor 7.7 5.8 20.8 17.4
Payable amounts outstanding to vendor $ 7.2 $ 3.8 $ 7.2 $ 3.8