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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 58,778 $ 51,816  
Less accumulated depreciation (8,871) (4,347)  
Total property and equipment, net 49,907 47,469 $ 28,203
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,040 3,040  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 20,984 20,984  
Land improvements and building improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 14,731 14,106  
Equipment and computers [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 7,197 5,910  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 7,322 6,453  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 2,615 $ 1,323  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 2,889