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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
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income (loss) from continuing operations | $ 45,292 | $ (428,549) | $ (620,187)
Gain on reimbursement of drilling equipment | 29,443 | 12,322 | 26,959
Other gain (loss) on sale of assets | 5,432 | (11,280) | 19,816
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges | 182,366 | 172,195 | 167,513
Other income (expense) |  |  |
Interest and dividend income | 18,090 | 10,254 | 7,304
Interest expense | (19,203) | (23,955) | (24,474)
Gain (loss) on investment securities | 57,937 | 6,727 | (8,720)
Gain on sale of subsidiary | 0 | 0 | 14,963
Loss on extinguishment of debt | (60,083) | 0 | 0
Other | (11,115) | (5,657) | (5,384)
Total unallocated amounts | (14,374) | (12,631) | (16,311)
Income (loss) from continuing operations before income taxes | 30,918 | (441,180) | (636,498)
Operating Segments |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income (loss) from continuing operations | 151,267 | (303,494) | (544,389)
Segment Reconciling Items |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Gain on reimbursement of drilling equipment | 29,443 | 12,322 | 26,959
Other gain (loss) on sale of assets | 5,432 | (11,280) | 19,816
Corporate, Non-Segment |  |  |
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 | $ (140,850) | $ (126,097) | $ (122,573)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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