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Revenue - Financial Statement Impact of ASC 606 (Cash Flow) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Jan. 31, 2018
Jan. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss $ (36,637) $ (40,086)    
Adjustments to reconcile net loss to net cash provided by operating activities:        
Amortization of deferred commissions 3,675 4,990    
Changes in operating assets and liabilities:        
Accounts receivable, net 71,690 37,346    
Deferred commissions (4,716) (2,784)    
Deferred revenue (24,160) (17,669)    
Net cash provided by operating activities 18,440 $ 8,541 $ 61,800 $ (1,200)
Balances without adoption of ASC Topic 606 | Accounting Standards Update 2014-09        
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss (38,131)      
Adjustments to reconcile net loss to net cash provided by operating activities:        
Amortization of deferred commissions 5,962      
Changes in operating assets and liabilities:        
Accounts receivable, net 71,304      
Deferred commissions (2,763)      
Deferred revenue (26,520)      
Net cash provided by operating activities 18,440      
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09        
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss 1,494      
Adjustments to reconcile net loss to net cash provided by operating activities:        
Amortization of deferred commissions (2,287)      
Changes in operating assets and liabilities:        
Accounts receivable, net 386      
Deferred commissions (1,953)      
Deferred revenue $ 2,360