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Leases - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Leases [Abstract]          
Right of use assets $ 9,157   $ 9,157   $ 9,312
Operating cash paid to settle lease liabilities     $ 848 $ 668  
Remaining lease term (in years)     10 years    
Option to extend, term (in years)     5 years    
Option to terminate, term (in years)     1 year    
Operating lease, expense 683 $ 576 $ 1,315 1,125  
Operating lease, short term, expense $ 245 $ 222 $ 467 $ 457  
Weighted average remaining lease term, operating lease (in years) 6 years 10 months 24 days   6 years 10 months 24 days    
Weighted average discount rate, operating lease 4.10%   4.10%    
Weighted average remaining lease term, finance lease (in years) 4 years 9 months 18 days   4 years 9 months 18 days    
Weighted average discount rate, finance lease 10.00%   10.00%    
Operating lease, leases not yet commenced, future minimum lease payments $ 981   $ 981    
Operating lease, leases not yet commenced, term (in years) 5 years   5 years