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Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jan. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,109,255 $ 855,587
Less accumulated depreciation and amortization (373,812) (308,978)
Property and equipment, net 735,443 546,609
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 18,593 8,451
Buildings    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 389,320 255,093
Computers, equipment, and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 510,677 425,025
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 36,557 34,809
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 154,108 132,209
Construction in Progress Related to Owned Real Estate Projects    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 297,000 $ 177,000