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Income Taxes (Tables) | 12 Months Ended
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Apr. 30, 2022
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | Income tax expense attributable to earnings consisted of the following components:
| Years ended April 30,
| 2022 |  | 2021 |  | 2020
Current tax expense: |  |  |  |  |
Federal | $ | 4,382 |  |  | $ | 73,950 |  |  | 22,182 |
State | 13,835 |  |  | 16,397 |  |  | 6,210 |
| 18,217 |  |  | 90,347 |  |  | 28,392 |
Deferred tax expense | 82,721 |  |  | 4,123 |  |  | 49,810 |
Total income tax expense | $ | 100,938 |  |  | $ | 94,470 |  |  | 78,202 |
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows:
| As of April 30,
| 2022 |  | 2021
Deferred tax assets: |  |  |
Accrued liabilities and reserves | $ | 30,932 |  |  | $ | 29,583 |
Workers compensation | 9,922 |  |  | 9,000 |
Operating and finance lease obligations | 46,693 |  |  | 9,186 |
Asset retirement obligations | 7,361 |  |  | 6,294 |
Deferred compensation | 3,540 |  |  | 4,221 |
Equity compensation | 9,567 |  |  | 9,131 |
State net operating losses & tax credits | 4,021 |  |  | 928 |
Other | 3,548 |  |  | 3,068 |
Total gross deferred tax assets | 115,584 |  |  | 71,411 |
Less valuation allowance | 250 |  |  | — |
Total net deferred tax assets | 115,334 |  |  | 71,411 |
Deferred tax liabilities: |  |  |
Property and equipment depreciation | (597,740) |  |  | (484,065) |
Goodwill | (34,869) |  |  | (27,047) |
Other | (3,197) |  |  | (20) |
Total gross deferred tax liabilities | (635,806) |  |  | (511,132) |
Net deferred tax liability | $ | (520,472) |  |  | (439,721) |
Schedule of Effective Income Tax Rate Reconciliation |
| Years ended April 30,
| 2022 |  | 2021 |  | 2020
Income taxes at the statutory rates | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Federal tax credits | (1.8) | % |  | (1.5) | % |  | (1.9) | %
State income taxes, net of federal tax benefit | 3.8 | % |  | 3.5 | % |  | 4.0 | %
Impact of phased-in state law changes, net of federal benefit | (0.8) | % |  | — | % |  | (0.2) | %
ASU 2016-09 benefit (stock-based compensation) | (1.0) | % |  | (0.6) | % |  | (0.5) | %
Other | 1.7 | % |  | 0.8 | % |  | 0.5 | %
| 22.9 | % |  | 23.2 | % |  | 22.9 | %
Schedule of Unrecognized Tax Benefits | is as follows:
| 2022 |  | 2021
Beginning balance | $ | 9,316 |  |  | $ | 8,907 |
Additions based on tax positions related to current year | 2,953 |  |  | 2,356 |
Reductions due to lapse of applicable statute of limitations | (2,010) |  |  | (1,947) |
Ending balance | $ | 10,259 |  |  | $ | 9,316 |

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