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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Gain on sale of assets | $ 4,279 | $ 5,545
Selling, general and administrative | 49,808 | 54,508
Operating income from continuing operations | 31,368 | 54,289
Other income (expense) |  |
Interest and dividend income | 2,214 | 2,450
Interest expense | (6,100) | (4,720)
Gain (loss) on investment securities | 2,821 | (42,844)
Gain on sale of subsidiary | 14,963 | 0
Other | (399) | 541
Total other income (expense) | 13,499 | (44,573)
Income from continuing operations before income taxes | 44,867 | 9,716
Operating Segment |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Operating income from continuing operations | 60,345 | 84,719
Segment Reconciling Items |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Gain on sale of assets | 4,279 | 5,545
Corporate |  |
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract] |  |
Selling, general and administrative | $ (33,256) | $ (35,975)

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