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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Jan. 31, 2013
Segment Reporting Information [Line Items]          
Total inventories $ 347,064 $ 322,823 $ 347,064 $ 322,823 $ 282,411
Total property and equipment, net 731,421 722,058 731,421 722,058 733,416
Total net sales 758,524 676,269 1,406,701 1,245,199  
Total income from operations 119,317 95,938 192,283 148,853  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 324,007 303,886 324,007 303,886 265,787
Total property and equipment, net 728,597 718,911 728,597 718,911 730,489
Total net sales 714,991 639,031 1,326,962 1,176,777  
Total income from operations 116,572 94,150 188,983 147,057  
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 23,057 18,937 23,057 18,937 16,624
Total property and equipment, net 2,824 3,147 2,824 3,147 2,927
Total net sales 45,877 38,699 83,666 71,278  
Total income from operations 11,612 9,753 19,945 17,747  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (2,344) (1,461) (3,927) (2,856)  
Total income from operations (212) (118) (380) (264)  
Total Segment Operating Income
          
Segment Reporting Information [Line Items]          
Total income from operations 127,972 103,785 208,548 164,540  
General Corporate Expenses
          
Segment Reporting Information [Line Items]          
General corporate expenses $ (8,655) $ (7,847) $ (16,265) $ (15,687)