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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
Segment Reporting Information [Line Items]          
Total net sales $ 973,533 $ 892,774 $ 2,821,675 $ 2,526,895  
General corporate expenses (11,547) (9,706) (33,796) (38,935)  
Total income from operations 96,357 72,888 267,105 169,104  
Total inventory 451,659 449,957 451,659 449,957 $ 351,395
Total property and equipment, net 808,883 829,106 808,883 829,106 813,768
Retail Operations          
Segment Reporting Information [Line Items]          
Total inventory 413,102 403,631 413,102 403,631 300,493
Total property and equipment, net 806,452 826,296 806,452 826,296 811,128
Wholesale Operations          
Segment Reporting Information [Line Items]          
Total inventory 38,557 46,326 38,557 46,326 50,902
Total property and equipment, net 2,431 2,810 2,431 2,810 $ 2,640
Operating Segments          
Segment Reporting Information [Line Items]          
Total income from operations 107,904 82,594 300,901 208,039  
Operating Segments | Retail Operations          
Segment Reporting Information [Line Items]          
Total net sales 878,869 808,546 2,556,460 2,289,526  
Total income from operations 88,538 61,667 246,833 150,575  
Operating Segments | Wholesale Operations          
Segment Reporting Information [Line Items]          
Total net sales 97,732 88,663 273,966 245,866  
Total income from operations 19,150 20,866 53,770 57,373  
Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total net sales (3,068) (4,435) (8,751) (8,497)  
Total income from operations $ 216 $ 61 $ 298 $ 91