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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
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Gain on sale of assets | $ 1,042 | $ 46,775 | $ 39,691
Corporate selling, general and administrative costs, corporate depreciation and corporate restructuring charges | 172,195 | 167,513 | 194,416
Operating income (loss) from continuing operations | (428,549) | (620,187) | 20,582
Other income (expense) |  |  |
Interest and dividend income | 10,254 | 7,304 | 9,468
Interest expense | (23,955) | (24,474) | (25,188)
Gain (loss) on investment securities | 6,727 | (8,720) | (54,488)
Gain on sale of subsidiary | 0 | 14,963 | 0
Other | (5,657) | (5,384) | (1,596)
Total other income (expense) | (12,631) | (16,311) | (71,804)
Loss from continuing operations before income taxes | (441,180) | (636,498) | (51,222)
Operating Segments |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Operating income (loss) from continuing operations | (303,494) | (544,389) | 109,233
Segment Reconciling Items |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |
Gain on sale of assets | 1,042 | 46,775 | 39,691
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 | $ (126,097) | $ (122,573) | $ (128,342)

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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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