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Leases - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Oct. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Lessee Lease Description [Line Items]    
Operating lease cost $ 444,000 $ 918,000
Short-term operating lease costs 49,000 130,000
Financing lease Amortization 525,000 1,000,000.0
Financing lease interest expense $ 507,000 $ 1,000,000.0
Operating leases, weighted average lease term 4 years 4 months 24 days 4 years 4 months 24 days
Operating leases, weighted average discount rate 4.60% 4.60%
Financing leases, weighted average lease term 18 years 18 years
Financing leases, weighted average discount rate 5.00% 5.00%
Cash paid for amounts included in measurement of liabilities and operating cash flows $ 1,100,000 $ 2,500,000
National Logistics Facility    
Lessee Lease Description [Line Items]    
Percentage of sublease   59.00%
National Logistics Facility | Other Income/(Expense)    
Lessee Lease Description [Line Items]    
Income related to sublease agreement   $ 303,000