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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Jan. 31, 2012
Segment Reporting Information [Line Items]          
Total inventories $ 395,406 $ 367,407 $ 395,406 $ 367,407 $ 250,073
Total property and equipment, net 734,793 670,752 734,793 670,752 684,979
Total net sales 692,894 609,953 1,938,093 1,743,153  
Total income from operations 93,510 73,361 242,363 220,192  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 374,865 354,907 374,865 354,907 237,825
Total property and equipment, net 731,715 667,346 731,715 667,346 681,501
Total net sales 651,408 571,072 1,828,185 1,641,816  
Total income from operations 90,961 69,270 238,018 220,420  
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 20,541 12,500 20,541 12,500 12,248
Total property and equipment, net 3,078 3,406 3,078 3,406 3,478
Total net sales 43,559 41,320 114,837 108,097  
Total income from operations 10,377 [1] 10,213 [1] 28,124 [1] 20,449 [1]  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (2,073) (2,439) (4,929) (6,760)  
Total income from operations (244) 3 (508) (675)  
Total Segment Operating Income
          
Segment Reporting Information [Line Items]          
Total income from operations 101,094 79,486 265,634 240,194  
General Corporate Expenses
          
Segment Reporting Information [Line Items]          
General corporate expenses $ (7,584) $ (6,125) $ (23,271) $ (20,002)  
[1] Increase in Wholesale segment income from operations for the nine months ended October 31, 2012 as compared to the prior year comparable period was principally due to one-time charges included in the nine months ended October 31, 2011 resulting from the discontinuation of wholesale distribution of the Leifsdottir brand, which began in the first quarter of fiscal 2012 and was principally completed by the end of the second quarter of fiscal 2012.