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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Jan. 31, 2013
Segment Reporting Information [Line Items]          
Total inventories $ 406,712 $ 395,406 $ 406,712 $ 395,406 $ 282,411
Total property and equipment, net 783,662 734,793 783,662 734,793 733,416
Total net sales 774,049 692,894 2,180,750 1,938,093  
Total income from operations 105,459 93,510 297,742 242,363  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 380,989 374,865 380,989 374,865 265,787
Total property and equipment, net 780,149 731,715 780,149 731,715 730,489
Total net sales 724,066 651,408 2,051,028 1,828,185  
Total income from operations 100,877 90,961 289,861 238,018  
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 25,723 20,541 25,723 20,541 16,624
Total property and equipment, net 3,513 3,078 3,513 3,078 2,927
Total net sales 52,928 43,559 136,595 114,837  
Total income from operations 13,337 10,377 33,282 28,124  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (2,945) (2,073) (6,873) (4,929)  
Total income from operations (311) (244) (692) (508)  
Total Segment Operating Income
          
Segment Reporting Information [Line Items]          
Total income from operations 113,903 101,094 322,451 265,634  
General Corporate Expenses
          
Segment Reporting Information [Line Items]          
General corporate expenses $ (8,444) $ (7,584) $ (24,709) $ (23,271)