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Leases - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Leases [Abstract]    
Right of use assets $ 10,082 $ 10,082
Finance lease, net value 134 134
Finance lease, accumulated amortization 25 25
Operating cash paid to settle lease liabilities   $ 354
Remaining lease term   10 years
Option to extend, term   5 years
Option to terminate, term   1 year
Operating lease, expense 576 $ 1,125
Operating lease, short term, expense $ 222 $ 457
Weighted average remaining lease term, operating lease 8 years 8 years
Weighted average discount rate, operating lease 4.10% 4.10%
Weighted average remaining lease term, finance lease 5 years 10 months 24 days 5 years 10 months 24 days
Weighted average discount rate, finance lease 10.00% 10.00%