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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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