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Revenue Recognition - Additional Information (Details) - USD ($)
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Apr. 30, 2021
Revenue Recognition [Line Items]      
Amounts received for reimbursement of travel and other out-of-pocket expenses $ 29,000 $ 4,000  
Deferred revenue recognized 16,300,000    
Transaction price allocated to remaining performance obligations 122,000,000    
Total deferred commissions 37,316,000   $ 37,682,000
Impairment losses $ 0 0  
Minimum      
Revenue Recognition [Line Items]      
Contractual period of maintenance contract 1 year    
Maximum      
Revenue Recognition [Line Items]      
Contractual period of maintenance contract 3 years    
Sales Commissions      
Revenue Recognition [Line Items]      
Total deferred commissions $ 3,700,000   $ 3,900,000
Amortization of sales commissions $ 500,000 $ 400,000