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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 51,816 $ 30,542  
Less accumulated depreciation (4,347) (2,339)  
Total property and equipment, net 47,469 28,203 $ 2,445
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 14,106    
Equipment and computers [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 5,910 3,103  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 6,453 1,207  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,323 1,228  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 980