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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Jan. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Non-marketable equity and other investments $ 31,605 $ 29,205  
Prepayments for computing infrastructure platform 11,403 13,588 $ 2,000
Technology patents, net 10,790 11,217  
Acquired land leasehold interest, net 9,544 9,570  
Deposits 4,731 4,492  
Net deferred tax assets 2,097 1,884  
Other 40,768 39,762  
Total $ 110,938 $ 109,718