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Leases - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Leases [Abstract]      
Operating lease cost   $ 1,100,000 $ 2,800,000
Short-term operating lease costs   $ 293,000 772,000
Financing lease Amortization $ 526,000   1,600,000
Financing lease interest expense $ 515,000   $ 1,600,000
Operating leases, weighted average lease term 4 years 2 months 12 days   4 years 2 months 12 days
Operating leases, weighted average discount rate 4.40%   4.40%
Financing leases, weighted average lease term 18 years 8 months 12 days   18 years 8 months 12 days
Financing leases, weighted average discount rate 5.00%   5.00%
Cash paid for amounts included in measurement of liabilities and operating cash flows $ 1,500,000   $ 4,300,000