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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of Segment Operating Income (Loss) to Income from Continuing Operations before Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income | $ 3,318 | $ 457,449 | $ 568,308
Acquisition transaction costs | 54,702 | 14,982 | 0
Gain on reimbursement of drilling equipment | 33,398 | 33,309 | 48,173
Other loss on sale of assets | (1,541) | (5,139) | (8,016)
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges | 287,052 | 244,883 | 206,687
Other income (expense) |  |  |
Interest and dividend income | 35,207 | 41,168 | 28,393
Interest expense | (107,808) | (29,093) | (17,283)
Gain (loss) on investment securities | (22,377) | 13,953 | 11,299
Foreign currency exchange loss | (9,682) | (5,550) | (6,419)
Other | 27,229 | 3,093 | 9,081
Other income (expense) | (77,431) | 23,571 | 25,071
Income (loss) before income taxes | (74,113) | 481,020 | 593,379
Operating Segments |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income | 338,208 | 627,690 | 653,801
Acquisition transaction costs | 4,597 |  |
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges | 89,898 | 74,134 | 71,833
Segment Reconciling Items |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income | (103,397) | (1,359) | 15,876
Gain on reimbursement of drilling equipment | 33,398 | 33,309 | 48,173
Other loss on sale of assets | (1,541) | (5,139) | (8,016)
Investments and corporate operations |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges | (259,351) | (198,313) | (146,197)
Operating Segments Excluding Intersegment Elimination |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income | $ 230,812 | $ 627,592 | $ 674,348

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- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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