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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income | $ 110,572 | $ 175,205 | $ 234,040 | $ 319,428
Gain on reimbursement of drilling equipment | 7,461 | 11,574 | 14,955 | 27,298
Other gain (loss) on sale of assets | (2,431) | 2,519 | 12 | 4,898
Corporate selling, general and administrative costs and corporate depreciation | 62,037 | 52,855 | 118,614 | 101,310
Other income (expense) |  |  |  |
Interest and dividend income | 6,567 | 5,055 | 17,301 | 9,760
Interest expense | (4,261) | (4,239) | (8,633) | (8,594)
Gain (loss) on investment securities | 3,747 | 39,752 | (287) | 24,661
Other | 400 | (604) | (143) | (546)
Total unallocated amounts | 6,453 | 39,964 | 8,238 | 25,281
Income before income taxes | 117,025 | 215,169 | 242,278 | 344,709
Operating Segments |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income | 152,790 | 197,347 | 306,022 | 357,951
Segment Reconciling Items |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain on reimbursement of drilling equipment | 7,461 | 11,574 | 14,955 | 27,298
Other gain (loss) on sale of assets | (2,431) | 2,519 | 12 | 4,898
Corporate, Non-Segment |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Corporate selling, general and administrative costs and corporate depreciation | $ (47,248) | $ (36,235) | $ (86,949) | $ (70,719)

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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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