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Schedule of Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Jan. 31, 2016
Segment Reporting Information [Line Items]      
Total inventory $ 359,865 $ 397,998 $ 330,223
Total property and equipment, net 871,504 899,324 863,137
Total net sales 762,577 739,010  
General corporate expenses (9,956) (8,493)  
Total income from operations 50,483 53,054  
Operating Segments      
Segment Reporting Information [Line Items]      
Total income from operations 60,439 61,547  
Operating Segments | Retail Operations      
Segment Reporting Information [Line Items]      
Total inventory 324,940 359,112 289,170
Total property and equipment, net 867,813 895,399 859,277
Total net sales 700,193 685,009  
Total income from operations 50,799 51,532  
Operating Segments | Wholesale Operations      
Segment Reporting Information [Line Items]      
Total inventory 34,925 38,886 41,053
Total property and equipment, net 3,691 3,925 $ 3,860
Total net sales 64,488 57,614  
Total income from operations 9,811 10,368  
Intersegment Elimination      
Segment Reporting Information [Line Items]      
Total net sales (2,104) (3,613)  
Total income from operations $ (171) $ (353)