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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Apr. 30, 2019
Revenue Recognition [Line Items]      
Expense reimbursement included in professional services $ 27,383 $ 27,399  
Deferred revenue recognized 14,000    
Transaction price allocated to remaining performance obligations $ 72,000    
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months    
Total deferred commissions $ 32,704   $ 33,283
Minimum      
Revenue Recognition [Line Items]      
Contractual period of maintenance contract 1 year    
Maximum      
Revenue Recognition [Line Items]      
Contractual period of maintenance contract 3 years    
Reimbursement      
Revenue Recognition [Line Items]      
Expense reimbursement included in professional services $ 400 $ 300  
Sales Commissions      
Revenue Recognition [Line Items]      
Total deferred commissions 3,100   $ 2,300
Amortization of sales commissions $ 200