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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | ---
Deferred tax assets: |  |
Accrued liabilities and reserves | $ 9,075 | $ 7,031
Deferred revenue | 15,222 | 15,565
Accrued bonus compensation | 10,272 | 9,361
Workers compensation | 11,281 | 11,500
Operating and finance lease obligations | 55,739 | 52,464
Asset retirement obligations | 10,036 | 9,404
Deferred compensation | 2,909 | 3,242
Equity compensation | 8,018 | 8,305
State net operating losses and tax credits | 2,568 | 1,807
Other | 4,523 | 3,551
Total gross deferred tax assets | 129,643 | 122,230
Less valuation allowance | 550 | 250
Total net deferred tax assets | 129,093 | 121,980
Deferred tax liabilities: |  |
Property and equipment depreciation | (667,680) | (617,154)
Goodwill | (52,900) | (43,900)
Other | (5,363) | (4,524)
Total gross deferred tax liabilities | (725,943) | (665,578)
Net deferred tax liability | $ (596,850) | $ (543,598)

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