DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations	$ (8,335)	$ 92,423	$ (2,871)
Plastics [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	166,262	460,914
Cost of goods and services	0	132,100	389,416
Gross profit	0	34,162	71,498
Selling, general and administrative expenses	9,500	26,303	43,518
Restructuring charges	0	0	0
Total operating expenses	9,500	26,303	43,518
Income from discontinued operations	(9,500)	7,859	27,980
Gain on sale of business	0	112,964	0
Interest expense, net	0	(155)	(63)
Disposal Group, Including Discontinued Operation, Other Income (Expense)	0	(687)	59
Total other income (expense)	0	112,122	(4)
Income (loss) from discontinued operations	$ (9,500)	$ 119,981	$ 27,976