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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Jan. 31, 2013
Segment Reporting Information [Line Items]      
Total inventories $ 325,471 $ 299,750 $ 282,411
Total property and equipment, net 721,872 711,932 733,416
Total net sales 648,177 568,930  
Total income from operations 72,966 52,915  
Retail Operations
      
Segment Reporting Information [Line Items]      
Total inventories 309,277 285,562 265,787
Total property and equipment, net 719,505 708,635 730,489
Total net sales 611,971 537,746  
Total income from operations 72,412 52,907  
Wholesale Operations
      
Segment Reporting Information [Line Items]      
Total inventories 16,194 14,188 16,624
Total property and equipment, net 2,367 3,297 2,927
Total net sales 37,789 32,579  
Total income from operations 8,332 7,994  
Intersegment Elimination
      
Segment Reporting Information [Line Items]      
Total net sales (1,583) (1,395)  
Total income from operations (168) (146)  
Total Segment Operating Income
      
Segment Reporting Information [Line Items]      
Total income from operations 80,576 60,755  
General Corporate Expenses
      
Segment Reporting Information [Line Items]      
General corporate expenses $ (7,610) $ (7,840)