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Leases - Schedule of Assets and Liabilities Related to Operating and Financing Leases (Detail) - USD ($)
$ in Thousands
Apr. 30, 2026
Apr. 30, 2025
Operating Leases    
Right-of-use assets $ 0 $ 1,623
Accumulated amortization 0 (1,211)
Right-of-use assets, net 0 $ 412
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   Other assets
Current liabilities $ 0 $ 233
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue Accrued expenses and deferred revenue
Non-current liabilities $ 0 $ 318
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]   Other non-current liabilities
Total operating lease liabilities 0 $ 551
Finance Leases    
Right-of-use assets 41,437 41,631
Accumulated depreciation (14,726) (12,973)
Right-of-use assets, net $ 26,711 $ 28,658
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, plant, and equipment, net of accumulated depreciation and amortization of $397,668 on April 30, 2026 and $368,811 on April 30, 2025 Property, plant, and equipment, net of accumulated depreciation and amortization of $397,668 on April 30, 2026 and $368,811 on April 30, 2025
Current liabilities $ 1,858 $ 1,701
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue Accrued expenses and deferred revenue
Non-current liabilities $ 32,163 $ 33,703
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current liabilities Non-current liabilities
Total finance lease liabilities $ 34,021 $ 35,404