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Related Party Transactions - Selected Results Related to Vendor and Percentages (Detail) - Merchandise Inventory Purchase [Member] - USD ($)
$ in Thousands
3 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Related Party Transaction [Line Items]    
Purchases as a percent of total merchandise purchases 21.70% 15.40%
Vendor [Member]    
Related Party Transaction [Line Items]    
Purchases $ 11,702 $ 8,546