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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Jan. 31, 2018
Segment Reporting Information [Line Items]      
Total net sales $ 855,688 $ 761,190  
General corporate expenses (12,815) (15,148)  
Total income from operations 53,896 21,036  
Total inventory 404,617 359,493 $ 351,395
Total property and equipment, net 819,725 851,259 813,768
Operating Segments      
Segment Reporting Information [Line Items]      
Total income from operations 66,711 36,184  
Operating Segments | Retail Operations      
Segment Reporting Information [Line Items]      
Total net sales 775,564 690,352  
Total income from operations 51,872 19,905  
Total inventory 353,423 324,126 300,493
Total property and equipment, net 817,277 847,926 811,128
Operating Segments | Wholesale Operations      
Segment Reporting Information [Line Items]      
Total net sales 82,941 72,949  
Total income from operations 14,805 16,269  
Total inventory 51,194 35,367 50,902
Total property and equipment, net 2,448 3,333 $ 2,640
Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total net sales (2,817) (2,111)  
Total income from operations $ 34 $ 10