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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Abstract]
Segment operating income (loss)	$ (147,691)	$ 35,225	$ 48,855	$ 89,726
Gain on sale of assets	9,960	4,313	27,050	15,133
Corporate selling, general and administrative costs and corporate depreciation	(30,143)	(33,232)	(94,344)	(96,108)
Operating income (loss) from continuing operations	(167,874)	6,306	(18,439)	8,751
Nonoperating Income (Expense) [Abstract]
Interest and dividend income	2,349	2,109	6,861	5,680
Interest expense	(6,257)	(5,993)	(17,145)	(17,794)
Loss on investment securities	(13,271)	0	(50,228)	0
Other	(1,599)	(61)	(1,051)	170
Total other income (expense)	(18,778)	(3,945)	(61,563)	(11,944)
Income (loss) from continuing operations before income taxes	$ (186,652)	$ 2,361	$ (80,002)	$ (3,193)

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Represents the aggregate total costs of general and administrative as well as depreciation expenses of the corporate. General and administrative costs include salaries of non-sales personnel, rent, utilities, communication, etc.

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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.

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