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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								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations	$ 39,021	$ (167,874)	$ 95,146	$ 54,289	$ 24,213	$ 6,306	$ (1,164)	$ 3,609	$ 20,582	$ 32,964	$ (169,087)
Gain on sale of assets									39,691	22,660	20,627
Corporate depreciation									556,900	578,400	584,400
Corporate selling, general and administrative costs									194,416	199,257	147,548
Other income (expense)
Interest and dividend income									9,468	8,017	5,915
Interest expense									(25,188)	(24,265)	(19,747)
Gain (loss) on investment securities									(54,488)	1	0
Other									(1,596)	(876)	(1,679)
Total other income (expense)									(71,804)	(17,123)	(15,511)
Income (loss) from continuing operations before income taxes									(51,222)	15,841	(184,598)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations									109,233	140,021	(87,545)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gain on sale of assets									39,691	22,660	20,627
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate depreciation									(11,338)	(13,140)	(15,546)
Corporate selling, general and administrative costs									$ (117,004)	$ (116,577)	$ (86,623)

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