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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]      
Total inventories $ 349,045 $ 325,471 $ 311,207
Total property and equipment, net 836,244 721,872 806,909
Total net sales 686,310 648,177  
General corporate expenses (10,579) (7,610)  
Total income from operations 59,821 72,966  
Retail Operations
      
Segment Reporting Information [Line Items]      
Total inventories 320,961 309,277 282,590
Total property and equipment, net 831,854 719,505 802,965
Wholesale Operations
      
Segment Reporting Information [Line Items]      
Total inventories 28,084 16,194 28,617
Total property and equipment, net 4,390 2,367 3,944
Operating Segments
      
Segment Reporting Information [Line Items]      
Total income from operations 70,400 80,576  
Operating Segments | Retail Operations
      
Segment Reporting Information [Line Items]      
Total net sales 640,430 611,971  
Total income from operations 60,649 72,412  
Operating Segments | Wholesale Operations
      
Segment Reporting Information [Line Items]      
Total net sales 48,290 37,789  
Total income from operations 9,991 8,332  
Intersegment Elimination
      
Segment Reporting Information [Line Items]      
Total net sales (2,410) (1,583)  
Total income from operations $ (240) $ (168)