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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Jan. 31, 2015
Segment Reporting Information [Line Items]          
Total inventories $ 384,404 $ 362,028 $ 384,404 $ 362,028 $ 358,237
Total property and equipment, net 900,302 868,642 900,302 868,642 889,232
Total net sales 867,460 811,253 1,606,470 1,497,563  
General corporate expenses (13,773) (9,929) (22,266) (20,508)  
Total income from operations 103,751 105,117 156,805 164,938  
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 117,524 115,046 179,071 185,446  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total inventories 339,870 329,450 339,870 329,450 314,940
Total property and equipment, net 896,400 864,216 896,400 864,216 885,200
Total net sales 795,740 752,116 1,480,749 1,392,546  
Total income from operations 100,057 100,130 151,589 160,779  
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total inventories 44,534 32,578 44,534 32,578 43,297
Total property and equipment, net 3,902 4,426 3,902 4,426 $ 4,032
Total net sales 74,627 61,966 132,241 110,256  
Total income from operations 17,720 15,175 28,088 25,166  
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (2,907) (2,829) (6,520) (5,239)  
Total income from operations $ (253) $ (259) $ (606) $ (499)