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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain (loss) on sale of assets | $ 3,434 | $ 4,201 | $ (2,745) | $ 18,790
Corporate selling, general and administrative costs, corporate depreciation, and corporate restructuring charges | 41,719 | 43,108 | 120,371 | 134,894
Operating loss from continuing operations | (77,367) | (57,584) | (331,513) | (544,757)
Other income (expense) |  |  |  |
Interest and dividend income | 1,527 | 771 | 8,225 | 6,551
Interest expense | (5,963) | (6,125) | (17,861) | (18,320)
Gain (loss) on investment securities | 2,409 | 2,267 | 7,853 | (7,325)
Gain on sale of subsidiary | 0 | 0 | 0 | 14,963
Other | (970) | (2,914) | (3,027) | (3,711)
Total other income (expense) | (2,997) | (6,001) | (4,810) | (7,842)
Loss from continuing operations before income taxes | (80,364) | (63,585) | (336,323) | (552,599)
Operating Segment |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Operating loss from continuing operations | (49,542) | (27,295) | (240,919) | (464,873)
Segment Reconciling Items |  |  |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |  |  |
Gain (loss) on sale of assets | 3,434 | 4,201 | (2,745) | 18,790
Corporate |  |  |  |
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 | $ (31,259) | $ (34,490) | $ (87,849) | $ (98,674)

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