DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations	$ 92,423	$ (2,871)	$ 10,229
Plastics [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	166,262	460,914	480,126
Cost of goods and services	132,100	389,416	407,385
Gross profit	34,162	71,498	72,741
Selling, general and administrative expenses	26,303	43,518	45,673
Restructuring charges	0	0	5,900
Total operating expenses	26,303	43,518	51,573
Income from discontinued operations	7,859	27,980	21,168
Gain on sale of business	112,964	0	0
Interest expense, net	(155)	(63)	(1,234)
Other, net	(687)	59	1,018
Total other income (expense)	112,122	(4)	(216)
Income (loss) from discontinued operations	$ 119,981	$ 27,976	$ 20,952