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Leases - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Jan. 31, 2021
USD ($)
Jan. 31, 2021
USD ($)
Lessee Lease Description [Line Items]    
Operating lease cost $ 420,000 $ 1,300,000
Short-term operating lease costs 38,000 168,000
Financing lease Amortization 525,000 1,500,000
Financing lease interest expense $ 504,000 $ 1,000,000
Operating leases, weighted average lease term 4 years 3 months 18 days 4 years 3 months 18 days
Operating leases, weighted average discount rate 4.50% 4.50%
Financing leases, weighted average lease term 17 years 8 months 12 days 17 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 $ 1,100,000 $ 3,600,000
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   $ 1,100,000