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Leases - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
Leases [Abstract]          
Right of use assets $ 9,715   $ 9,715   $ 9,312
Operating cash paid to settle lease liabilities     $ 1,299 $ 1,154  
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 718 $ 645 $ 2,032 1,770  
Operating lease, short term, expense $ 267 $ 215 $ 733 $ 673  
Weighted average remaining lease term, operating lease (in years) 6 years 1 month 6 days   6 years 1 month 6 days    
Weighted average discount rate, operating lease 4.10%   4.10%    
Weighted average remaining lease term, finance lease (in years) 4 years 7 months 6 days   4 years 7 months 6 days    
Weighted average discount rate, finance lease 10.00%   10.00%