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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Jan. 31, 2015
Segment Reporting Information [Line Items]          
Total inventories $ 441,550 $ 467,097 $ 441,550 $ 467,097 $ 358,237
Total property and equipment, net 891,871 886,810 891,871 886,810 889,232
Total net sales 825,258 814,470 2,431,728 2,312,033  
General corporate expenses (7,661) (11,941) (29,927) (32,449)  
Total income from operations 80,325 76,465 237,130 241,403  
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 87,986 88,406 267,057 273,852  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total inventories 391,771 430,467 391,771 430,467 314,940
Total property and equipment, net 887,927 882,630 887,927 882,630 885,200
Total net sales 765,525 751,451 2,246,275 2,143,997  
Total income from operations 76,095 72,892 227,684 233,671  
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total inventories 49,779 36,630 49,779 36,630 43,297
Total property and equipment, net 3,944 4,180 3,944 4,180 $ 4,032
Total net sales 62,170 66,896 194,410 177,152  
Total income from operations 12,094 15,884 40,182 41,050  
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (2,437) (3,877) (8,957) (9,116)  
Total income from operations $ (203) $ (370) $ (809) $ (869)