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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, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain on sale of assets | $ 10,310 | $ 11,546 | $ 14,589 | $ 17,090
Selling, general and administrative | 41,978 | 43,506 | 91,786 | 98,014
Operating income (loss) from continuing operations | (518,541) | 95,146 | (487,173) | 149,435
Other income (expense) |  |  |  |
Interest and dividend income | 3,566 | 2,061 | 5,780 | 4,512
Interest expense | (6,095) | (6,167) | (12,195) | (10,888)
Gain (loss) on investment securities | (12,413) | 5,878 | (9,592) | (36,957)
Gain on sale of subsidiary | 0 | 0 | 14,963 | 0
Other | (398) | 17 | (797) | 548
Total other income (expense) | (15,340) | 1,789 | (1,841) | (42,785)
Income (loss) from continuing operations before income taxes | (533,881) | 96,935 | (489,014) | 106,650
Operating Segment |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating income (loss) from continuing operations | (498,079) | 111,870 | (437,578) | 196,545
Segment Reconciling Items |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain on sale of assets | 10,310 | 11,546 | 14,589 | 17,090
Corporate |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Selling, general and administrative | $ (30,772) | $ (28,270) | $ (64,184) | $ (64,200)

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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=118932676&loc=d3e3602-108585 + Details
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