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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Jan. 31, 2017
Segment Reporting Information [Line Items]          
Total net sales $ 872,931 $ 890,568 $ 1,634,121 $ 1,653,145  
General corporate expenses (14,081) (14,346) (29,229) (24,302)  
Total income from operations 75,180 118,212 96,216 168,695  
Total inventory 365,176 367,197 365,176 367,197 $ 338,590
Total property and equipment, net 843,058 878,607 843,058 878,607 867,786
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 89,261 132,558 125,445 192,997  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total net sales 790,628 815,762 1,480,980 1,515,955  
Total income from operations 69,003 115,242 88,908 166,041  
Total inventory 320,384 325,584 320,384 325,584 301,519
Total property and equipment, net 839,987 875,136 839,987 875,136 864,396
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total net sales 84,254 76,672 157,203 141,160  
Total income from operations 20,238 17,396 36,507 27,207  
Total inventory 44,792 41,613 44,792 41,613 37,071
Total property and equipment, net 3,071 3,471 3,071 3,471 $ 3,390
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (1,951) (1,866) (4,062) (3,970)  
Total income from operations $ 20 $ (80) $ 30 $ (251)