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Related Party Transactions - Selected Results Related to Vendor and Percentages (Detail) - Merchandise Inventory Purchase [Member] - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2016
May. 02, 2015
Related Party Transaction [Line Items]    
Purchases as a percent of total merchandise purchases 15.40% 12.70%
Vendor [Member]    
Related Party Transaction [Line Items]    
Purchases $ 8.5 $ 7.1
Cost of sales 8.7 6.4
Payable amounts outstanding at period end $ 2.1 $ 2.9