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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) | $ (128,269) | $ 113,457 | $ 4,780 | $ 349,862
Gain on reimbursement of drilling equipment | 6,773 | 9,732 | 26,149 | 24,687
Other loss on sale of assets | (1,347) | (2,730) | (2,136) | (2,718)
Corporate selling, general and administrative costs, corporate depreciation, corporate acquisition transaction costs, corporate asset impairment charges, and corporate restructuring charges | 65,506 | 60,194 | 209,407 | 177,963
Other income (expense) |  |  |  |
Interest and dividend income | 2,856 | 11,888 | 31,854 | 29,189
Interest expense | (29,200) | (4,336) | (79,836) | (12,969)
Gain (loss) on investment securities | (337) | 389 | 14,084 | 102
Foreign currency exchange loss | (9,216) | (2,144) | (16,137) | (4,509)
Other | 31,258 | 3,134 | 33,214 | 2,991
Total unallocated amounts | (4,639) | 8,931 | (16,821) | 14,804
Income (loss) before income taxes | (132,908) | 122,388 | (12,041) | 364,666
Operating Segments |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) | (63,985) | 160,262 | 202,620 | 468,649
Segment Reconciling Items |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain on reimbursement of drilling equipment | 6,773 | 9,732 | 26,149 | 24,687
Other loss on sale of assets | (1,347) | (2,730) | (2,136) | (2,718)
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 costs, corporate asset impairment charges, and corporate restructuring charges | $ (69,710) | $ (53,807) | $ (221,853) | $ (140,756)

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