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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Jan. 31, 2012
Segment Reporting Information [Line Items]          
Total inventories $ 322,823 $ 303,159 $ 322,823 $ 303,159 $ 250,073
Total property and equipment, net 722,058 626,188 722,058 626,188 684,979
Total net sales 676,269 609,181 1,245,199 1,133,200  
Total income from operations 95,938 87,995 148,853 146,831  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 303,886 288,989 303,886 288,989 237,825
Total property and equipment, net 718,911 622,695 718,911 622,695 681,501
Total net sales 639,031 577,282 1,176,777 1,070,744  
Total income from operations 94,150 88,182 147,057 151,150  
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 18,937 14,170 18,937 14,170 12,248
Total property and equipment, net 3,147 3,493 3,147 3,493 3,478
Total net sales 38,699 35,194 71,278 66,777  
Total income from operations 9,753 [1] 7,278 [1] 17,747 [1] 10,236 [1]  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (1,461) (3,295) (2,856) (4,321)  
Total income from operations (118) (607) (264) (678)  
Total Segment Operating Income
          
Segment Reporting Information [Line Items]          
Total income from operations 103,785 94,853 164,540 160,708  
General Corporate Expenses
          
Segment Reporting Information [Line Items]          
General corporate expenses $ (7,847) $ (6,858) $ (15,687) $ (13,877)  
[1] Increase in Wholesale segment income from operations for the six months ended July 31, 2012 as compared to the prior year comparable period was principally due to one-time charges included in the six months ended July 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.