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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Jan. 31, 2016
Segment Reporting Information [Line Items]          
Total inventory $ 367,197 $ 384,404 $ 367,197 $ 384,404 $ 330,223
Total property and equipment, net 878,607 900,302 878,607 900,302 863,137
Total net sales 890,568 867,460 1,653,145 1,606,470  
General corporate expenses (14,346) (13,773) (24,302) (22,266)  
Total income from operations 118,212 103,751 168,695 156,805  
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 132,558 117,524 192,997 179,071  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total inventory 325,584 339,870 325,584 339,870 289,170
Total property and equipment, net 875,136 896,400 875,136 896,400 859,277
Total net sales 815,762 795,740 1,515,955 1,480,749  
Total income from operations 115,242 100,057 166,041 151,589  
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total inventory 41,613 44,534 41,613 44,534 41,053
Total property and equipment, net 3,471 3,902 3,471 3,902 $ 3,860
Total net sales 76,672 74,627 141,160 132,241  
Total income from operations 17,396 17,720 27,207 28,088  
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (1,866) (2,907) (3,970) (6,520)  
Total income from operations $ (80) $ (253) $ (251) $ (606)