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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Segment Reporting Information [Line Items]      
Total net sales $ 3,086,608 $ 2,794,925 $ 2,473,801
General corporate expenses (29,257) (27,027) (18,066)
Total income from operations 426,831 374,285 284,725
Total depreciation expense for property and equipment 121,732 113,388 100,739
Total inventories 311,207 282,411  
Total property and equipment, net 806,909 733,416  
Total cash paid for property and equipment 186,101 168,875 190,010
Operating Segments
      
Segment Reporting Information [Line Items]      
Total net sales 3,086,608 2,794,925 2,473,801
Total income from operations 456,088 401,312 302,791
Operating Segments | Retail Operations
      
Segment Reporting Information [Line Items]      
Total net sales 2,908,981 2,646,284 2,340,794
Total income from operations 414,734 366,139 276,581
Total depreciation expense for property and equipment 120,960 112,645 99,645
Total inventories 282,590 265,787  
Total property and equipment, net 802,965 730,489  
Total cash paid for property and equipment 184,255 168,530 189,311
Operating Segments | Wholesale Operations
      
Segment Reporting Information [Line Items]      
Total net sales 185,792 154,957 140,657
Total income from operations 42,191 35,783 26,919
Total depreciation expense for property and equipment 772 743 1,094
Total inventories 28,617 16,624  
Total property and equipment, net 3,944 2,927  
Total cash paid for property and equipment 1,846 345 699
Intersegment Elimination
      
Segment Reporting Information [Line Items]      
Total net sales (8,165) (6,316) (7,650)
Total income from operations $ (837) $ (610) $ (709)