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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Segment Reporting Information [Line Items]          
Total net sales $ 992,454 $ 872,931 $ 1,848,142 $ 1,634,121  
General corporate expenses (9,434) (14,081) (22,249) (29,229)  
Total income from operations 116,852 75,180 170,748 96,216  
Total inventory 375,657 365,176 375,657 365,176 $ 351,395
Total property and equipment, net 807,084 843,058 807,084 843,058 813,768
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 126,286 89,261 192,997 125,445  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total net sales 902,027 790,628 1,677,591 1,480,980  
Total income from operations 106,423 69,003 158,295 88,908  
Total inventory 328,551 320,384 328,551 320,384 300,493
Total property and equipment, net 804,625 839,987 804,625 839,987 811,128
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total net sales 93,293 84,254 176,234 157,203  
Total income from operations 19,815 20,238 34,620 36,507  
Total inventory 47,106 44,792 47,106 44,792 50,902
Total property and equipment, net 2,459 3,071 2,459 3,071 $ 2,640
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (2,866) (1,951) (5,683) (4,062)  
Total income from operations $ 48 $ 20 $ 82 $ 30