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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 | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Gain on reimbursement of drilling equipment | $ 5,254 | $ 2,191
Corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges | 43,715 | 39,303
Operating loss from continuing operations | (42,611) | (93,223)
Other income (expense) |  |
Interest and dividend income | 2,589 | 1,879
Interest expense | (6,114) | (6,139)
Gain on investment securities | 47,862 | 2,924
Loss on extinguishment of debt | (60,083) | 0
Other | (542) | (1,480)
Total other income (expense) | (16,288) | (2,816)
Loss from continuing operations before income taxes | (58,899) | (96,039)
Operating Segment |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Operating loss from continuing operations | (12,731) | (76,558)
Segment Reconciling Items |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Gain on reimbursement of drilling equipment | 5,254 | 2,191
Gain (loss) on sale of assets | (1,029) | 10,145
Corporate G&A |  |
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 | $ (34,105) | $ (29,001)

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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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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