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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Reconciliation of Segment Operating Income (Loss) to Income from Continuing Operations before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) | $ 188,211 | $ (128,269) | $ 91,380 | $ 4,780
Gain on involuntary conversion | 13,581 | 0 | 13,581 | 0
Gain on reimbursement of drilling equipment | 6,036 | 6,773 | 18,099 | 26,149
Other gain (loss) on sale of assets | 120,044 | (1,347) | 119,423 | (2,136)
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction and integration costs, corporate asset impairment charges, and corporate restructuring charges | 65,849 | 65,506 | 207,373 | 209,407
Other income (expense) |  |  |  |
Interest and dividend income | 2,280 | 2,856 | 7,193 | 31,854
Interest expense | (24,439) | (29,200) | (75,860) | (79,836)
Gain (loss) on investment securities | (16,007) | (337) | (687) | 14,084
Foreign currency exchange gain (loss) | 1,885 | (9,216) | 4,864 | (16,137)
Other | (1,411) | 31,258 | (6,664) | 33,214
Total other income (expense) | (37,692) | (4,639) | (71,154) | (16,821)
Income (loss) before income taxes | 150,519 | (132,908) | 20,226 | (12,041)
Operating Segments Excluding Intersegment Elimination |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) | 105,556 | (63,985) | 116,712 | 202,620
Segment Reconciling Items |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) | 1,344 | (70,004) | (7,276) | (70,605)
Gain on involuntary conversion | 13,581 | 0 | 13,581 | 0
Gain on reimbursement of drilling equipment | 6,036 | 6,773 | 18,099 | 26,149
Other gain (loss) on sale of assets | 120,044 | (1,347) | 119,423 | (2,136)
Corporate, Non-Segment |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction and integration costs, corporate asset impairment charges, and corporate restructuring charges | $ (57,006) | $ (69,710) | $ (176,435) | $ (221,853)

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