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Schedule of Operations by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]          
Total inventories $ 467,097 $ 406,712 $ 467,097 $ 406,712 $ 311,207
Total property and equipment, net 886,810 783,662 886,810 783,662 806,909
Total net sales 814,470 774,049 2,312,033 2,180,750  
General corporate expenses (11,941) (8,444) (32,449) (24,709)  
Total income from operations 76,465 105,459 241,403 297,742  
Retail Operations
          
Segment Reporting Information [Line Items]          
Total inventories 430,467 380,989 430,467 380,989 282,590
Total property and equipment, net 882,630 780,149 882,630 780,149 802,965
Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total inventories 36,630 25,723 36,630 25,723 28,617
Total property and equipment, net 4,180 3,513 4,180 3,513 3,944
Operating Segments
          
Segment Reporting Information [Line Items]          
Total income from operations 88,406 113,903 273,852 322,451  
Operating Segments | Retail Operations
          
Segment Reporting Information [Line Items]          
Total net sales 751,451 724,066 2,143,997 2,051,028  
Total income from operations 72,892 100,877 233,671 289,861  
Operating Segments | Wholesale Operations
          
Segment Reporting Information [Line Items]          
Total net sales 66,896 52,928 177,152 136,595  
Total income from operations 15,884 13,337 41,050 33,282  
Intersegment Elimination
          
Segment Reporting Information [Line Items]          
Total net sales (3,877) (2,945) (9,116) (6,873)  
Total income from operations $ (370) $ (311) $ (869) $ (692)