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Leases - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Oct. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Leases [Abstract]    
Operating lease cost $ 928,000 $ 1,900,000
short-term operating lease costs 279,000 479,000
Financing lease Amortization 526,000 1,100,000
Financing lease interest expense $ 518,000 $ 1,000,000.0
Operating leases, weighted average lease term 4 years 7 months 6 days 4 years 7 months 6 days
Operating leases, weighted average discount rate 4.50% 4.50%
Financing leases, weighted average lease term 19 years 19 years
Financing leases, weighted average discount rate 5.00% 5.00%
Cash paid for amounts included in measurement of liabilities and operating cash flows $ 1,400,000 $ 2,800,000