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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]          
Total inventories $ 362,028 $ 347,064 $ 362,028 $ 347,064 $ 311,207
Total property and equipment, net 868,642 731,421 868,642 731,421 806,909
Total net sales 811,253 758,524 1,497,563 1,406,701  
General corporate expenses (9,929) (8,655) (20,508) (16,265)  
Total income from operations 105,117 119,317 164,938 192,283  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 329,450 324,007 329,450 324,007 282,590
Total property and equipment, net 864,216 728,597 864,216 728,597 802,965
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 32,578 23,057 32,578 23,057 28,617
Total property and equipment, net 4,426 2,824 4,426 2,824 3,944
Operating Segments
          
Segment Reporting Information [Line Items]          
Total income from operations 115,046 127,972 185,446 208,548  
Operating Segments | Retail Operations
          
Segment Reporting Information [Line Items]          
Total net sales 752,116 714,991 1,392,546 1,326,962  
Total income from operations 100,130 116,572 160,779 188,983  
Operating Segments | Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total net sales 61,966 45,877 110,256 83,666  
Total income from operations 15,175 11,612 25,166 19,945  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (2,829) (2,344) (5,239) (3,927)  
Total income from operations $ (259) $ (212) $ (499) $ (380)