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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income (loss) | $ 561,889 | $ 45,292 | $ (428,549)
Gain on reimbursement of drilling equipment | 48,173 | 29,443 | 12,322
Other gain (loss) on sale of assets | (8,016) | 5,432 | (11,280)
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges | 206,657 | 182,366 | 172,195
Other income (expense) |  |  |
Interest and dividend income | 28,393 | 18,090 | 10,254
Interest expense | (17,283) | (19,203) | (23,955)
Gain on investment securities | 11,299 | 57,937 | 6,727
Loss on extinguishment of debt | 0 | (60,083) | 0
Other | 9,081 | (10,714) | 5,652
Total unallocated amounts | 31,490 | (13,973) | (1,322)
Income (loss) before income taxes | 593,379 | 31,319 | (429,871)
Operating Segments |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income (loss) | 667,929 | 151,267 | (303,494)
Segment Reconciling Items |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Gain on reimbursement of drilling equipment | 48,173 | 29,443 | 12,322
Other gain (loss) on sale of assets | (8,016) | 5,432 | (11,280)
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 and corporate restructuring charges | $ (146,197) | $ (140,850) | $ (126,097)

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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