BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of segment operating income to income from continuing operations before income taxes
Segment operating income	$ 84,676	$ 29,687
Income from asset sales	5,545	5,565
Corporate general and administrative costs and corporate depreciation	(35,932)	(31,643)
Operating income from continuing operations	54,289	3,609
Other income (expense)
Interest and dividend income	2,450	1,724
Interest expense	(4,720)	(5,773)
Loss on investment securities	(42,844)
Other	541	441
Total other income (expense)	(44,573)	(3,608)
Income from continuing operations before income taxes	9,716	1
Operating segment
Reconciliation of segment operating income to income from continuing operations before income taxes
Segment operating income	$ 84,676	$ 29,687