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Income Taxes (Tables) | 12 Months Ended
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Apr. 30, 2023
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,
| 2023 |  | 2022 |  | 2021
Current tax expense: |  |  |  |  |
Federal | $ | 95,336 |  |  | $ | 4,382 |  |  | $ | 73,950 |
State | 22,365 |  |  | 13,835 |  |  | 16,397 |
| 117,701 |  |  | 18,217 |  |  | 90,347 |
Deferred tax expense | 23,126 |  |  | 82,721 |  |  | 4,123 |
Total income tax expense | $ | 140,827 |  |  | $ | 100,938 |  |  | $ | 94,470 |
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,
| 2023 |  | 2022
Deferred tax assets: |  |  |
Accrued liabilities and reserves | $ | 7,031 |  |  | $ | 11,699 |
Deferred revenue | 15,565 |  |  | 11,893 |
Accrued bonus compensation | 9,361 |  |  | 7,340 |
Workers compensation | 11,500 |  |  | 9,922 |
Operating and finance lease obligations | 52,464 |  |  | 46,693 |
Asset retirement obligations | 9,404 |  |  | 7,361 |
Deferred compensation | 3,242 |  |  | 3,540 |
Equity compensation | 8,305 |  |  | 9,567 |
State net operating losses and tax credits | 1,807 |  |  | 4,021 |
Other | 3,551 |  |  | 3,548 |
Total gross deferred tax assets | 122,230 |  |  | 115,584 |
Less valuation allowance | 250 |  |  | 250 |
Total net deferred tax assets | 121,980 |  |  | 115,334 |
Deferred tax liabilities: |  |  |
Property and equipment depreciation | (617,154) |  |  | (597,740) |
Goodwill | (43,900) |  |  | (34,869) |
Other | (4,524) |  |  | (3,197) |
Total gross deferred tax liabilities | (665,578) |  |  | (635,806) |
Net deferred tax liability | $ | (543,598) |  |  | $ | (520,472) |
Schedule of Effective Income Tax Rate Reconciliation |
| Years ended April 30,
| 2023 |  | 2022 |  | 2021
Income taxes at the statutory rates | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Federal tax credits | (1.3) | % |  | (1.8) | % |  | (1.5) | %
State income taxes, net of federal tax benefit | 4.0 | % |  | 3.8 | % |  | 3.5 | %
Impact of phased-in state law changes, net of federal benefit | (0.4) | % |  | (0.8) | % |  | — | %
ASU 2016-09 benefit (stock-based compensation) | (0.3) | % |  | (1.0) | % |  | (0.6) | %
Nondeductible executive compensation | 1.1 | % |  | 1.2 | % |  | 0.9 | %
Other | (0.1) | % |  | 0.5 | % |  | (0.1) | %
| 24.0 | % |  | 22.9 | % |  | 23.2 | %
Schedule of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2023 |  | 2022
Beginning balance | $ | 10,259 |  |  | $ | 9,316 |
Additions based on tax positions related to current year | 2,867 |  |  | 2,953 |
Reductions due to lapse of applicable statute of limitations | (2,169) |  |  | (2,010) |
Ending balance | $ | 10,957 |  |  | $ | 10,259 |

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