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Equity-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 3,906 $ 1,695 $ 2,534
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of common stock price based on closing price at the beginning or end of the last day of the purchase period   90.00%  
Purchase period   6 months  
Number of shares authorized   2.0  
Number of shares available for issuance 1.9    
Number of shares purchased under ESPP 0.1    
Average price per share $ 18.51    
Share-based compensation expense $ 300 $ 100