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INCOME TAXES (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Components of the Provision for Income Taxes | The components of the provision for income taxes are as follows:
| Year Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2023
Current: |  |  |  |  |
Federal | $ | 114,973 |  |  | $ | 136,110 |  |  | $ | 150,273 |
Foreign | 35,588 |  |  | 7,756 |  |  | 12,883 |
State | 13,935 |  |  | 16,180 |  |  | 16,523 |
| 164,496 |  |  | 160,046 |  |  | 179,679 |
Deferred: |  |  |  |  |
Federal | (44,564) |  |  | (18,785) |  |  | (20,337) |
Foreign | (30,174) |  |  | (2,102) |  |  | (1,254) |
State | (3,923) |  |  | (2,304) |  |  | 1,191 |
| (78,661) |  |  | (23,191) |  |  | (20,400) |
Total provision | $ | 85,835 |  |  | $ | 136,855 |  |  | $ | 159,279 |
Schedule of Domestic and Foreign Income (Loss) before Income Taxes | The amounts of domestic and foreign income (loss) before income taxes are as follows:
| Year Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2023
Domestic | $ | 339,966 |  |  | $ | 433,553 |  |  | $ | 584,891 |
Foreign | (414,079) |  |  | 47,467 |  |  | 8,488 |
| $ | (74,113) |  |  | $ | 481,020 |  |  | $ | 593,379 |
Schedule of Effective Income Tax Rates as Compared to the U.S. Federal Income Tax Rate | The reconciliation of our effective income tax rates to the U.S. Federal income tax rate is as follows:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
U.S. Federal income tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Effect of foreign taxes | (54.6) |  |  | 1.3 |  |  | 2.1 |
State income taxes, net of federal tax benefit | (9.6) |  |  | 2.2 |  |  | 2.4 |
Other impact of foreign operations | (15.8) |  |  | 1.7 |  |  | 0.2 |
Non-deductible meals and entertainment | (5.6) |  |  | 0.9 |  |  | 0.6 |
Equity compensation | (0.6) |  |  | (0.1) |  |  | (0.1) |
Excess officer's compensation | (4.8) |  |  | 0.8 |  |  | 0.4 |
Goodwill impairment | (54.6) |  |  | — |  |  | — |
Other | 8.8 |  |  | 0.7 |  |  | 0.2 |
Effective income tax rate | (115.8) | % |  | 28.5 | % |  | 26.8 | %
Schedule of Components of Net Deferred Tax Liabilities | The components of our net deferred tax liabilities are as follows:
| September 30,
(in thousands) | 2025 |  | 2024
Deferred tax liabilities: |  |  |
Property, plant and equipment | $ | 590,133 |  |  | $ | 534,161 |
Marketable securities | — |  |  | 18,877 |
Lease assets | 26,606 |  |  | — |
Other | 22,888 |  |  | 29,044 |
Total deferred tax liabilities | 639,627 |  |  | 582,082 |
Deferred tax assets: |  |  |
Pension reserves | 11,889 |  |  | 1,477 |
Marketable securities | 8,517 |  |  | — |
Self-insurance reserves | 4,909 |  |  | 4,619 |
Net operating loss and other tax carryforwards | 301,813 |  |  | 11,296 |
Accrued liabilities | 42,389 |  |  | 47,838 |
Lease liability | 29,443 |  |  | — |
Other | 35,307 |  |  | 33,126 |
Total deferred tax assets | 434,267 |  |  | 98,356 |
Valuation allowance | (418,640) |  |  | (11,755) |
Net deferred tax assets | 15,627 |  |  | 86,601 |
Net deferred tax liabilities | $ | 624,000 |  |  | $ | 495,481 |
Schedule of Reconciliation of the Change in Gross Unrecognized Tax Benefits | A reconciliation of the change in our gross unrecognized tax benefits are as follows:
(in thousands) | 2025 |  | 2024 |  | 2023
Unrecognized tax benefits at October 1, | $ | 156 |  |  | $ | 247 |  |  | $ | 960 |
Gross decreases - current period effect of tax positions | (1) |  |  | (14) |  |  | (534) |
Gross increases - current period effect of tax positions 1 | 20,485 |  |  | — |  |  | 6 |
Expiration of statute of limitations for assessments | (121) |  |  | (77) |  |  | (185) |
Unrecognized tax benefits at September 30, | $ | 20,519 |  |  | $ | 156 |  |  | $ | 247 |
(1)Gross increases - current period effect of tax positions for the year ended September 30, 2025 are related to the acquisition of KCA Deutag.

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