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Leases - Additional Information (Details)
 3 Months Ended
Jul. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Right of use assets $ 6,785,000
Finance lease, net value 140,000
Finance lease, accumulated amortization 19,000
Operating cash paid to settle lease liabilities $ 314,000
Remaining lease term 10 years
Option to extend, term 5 years
Option to terminate, term 1 year
Operating lease, expense $ 549,000
Operating lease, short term, expense $ 235,000
Weighted average remaining lease term, operating lease 8 years 1 month 6 days
Weighted average discount rate, operating lease 4.10%
Weighted average remaining lease term, finance lease 6 years 1 month 6 days
Weighted average discount rate, finance lease 10.00%
Pro Forma  
Lessee, Lease, Description [Line Items]  
Remaining lease term 10 years
Increase in operating lease, right of use asset $ 2,000,000
Increase in operating lease liability $ 2,000,000