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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2025
Apr. 30, 2024
Deferred tax assets:    
Accrued liabilities and reserves $ 8,996 $ 9,075
Deferred revenue 17,845 15,222
Accrued bonus compensation 10,023 10,272
Workers compensation 13,013 11,281
Operating and finance lease obligations 144,997 55,739
Asset retirement obligations 12,921 10,036
Deferred compensation 3,151 2,909
Equity compensation 8,944 8,018
State net operating losses and tax credits 2,500 2,568
Other 8,197 4,523
Total gross deferred tax assets 230,587 129,643
Less valuation allowance 550 550
Total net deferred tax assets 230,037 129,093
Deferred tax liabilities:    
Property and equipment depreciation (799,404) (667,680)
Goodwill (66,754) (52,900)
Other (10,784) (5,363)
Total gross deferred tax liabilities (876,942) (725,943)
Net deferred tax liability $ (646,905) $ (596,850)