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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Segment Reporting Information [Line Items]      
Total net sales $ 2,794,925 $ 2,473,801 $ 2,274,102
Total income from operations 374,285 284,725 414,203
Total depreciation expense for property and equipment 113,388 100,739 92,403
Total inventories 282,411 250,073  
Total property and equipment, net 733,416 684,979  
Total cash paid for property and equipment 168,875 190,010 143,642
Retail Operations
      
Segment Reporting Information [Line Items]      
Total net sales 2,646,284 2,340,794 2,153,792
Total income from operations 366,139 276,581 418,403
Total depreciation expense for property and equipment 112,645 99,645 91,267
Total inventories 265,787 237,825  
Total property and equipment, net 730,489 681,501  
Total cash paid for property and equipment 168,530 189,311 142,791
Wholesale Operations
      
Segment Reporting Information [Line Items]      
Total net sales 154,957 140,657 124,768
Total income from operations 35,783 26,919 23,372
Total depreciation expense for property and equipment 743 1,094 1,136
Total inventories 16,624 12,248  
Total property and equipment, net 2,927 3,478  
Total cash paid for property and equipment 345 699 851
Intersegment Elimination
      
Segment Reporting Information [Line Items]      
Total net sales (6,316) (7,650) (4,458)
Total income from operations (610) (709) (389)
Total Segment Operating Income
      
Segment Reporting Information [Line Items]      
Total income from operations 401,312 302,791 441,386
General Corporate Expenses
      
Segment Reporting Information [Line Items]      
General corporate expenses $ (27,027) $ (18,066) $ (27,183)