DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 1	$ 0	$ 0
Restructuring charges	0	5,900,000	0
Income (loss) from discontinued operations	(2,871,000)	10,229,000	21,995,000
Plastics [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	460,914,000	480,126,000	532,741,000
Cost of goods and services	389,416,000	407,385,000	449,310,000
Gross profit	71,498,000	72,741,000	83,431,000
Selling, general and administrative expenses	43,518,000	45,673,000	49,324,000
Restructuring charges	0	5,900,000	0
Total operating expenses	43,518,000	51,573,000	49,324,000
Income from discontinued operations	27,980,000	21,168,000	34,107,000
Interest expense, net	63,000	1,234,000	358,000
Other, net	(59,000)	(1,018,000)	(821,000)
Total other income (expense)	4,000	216,000	(463,000)
Income (loss) from discontinued operations	$ 27,976,000	$ 20,952,000	$ 34,570,000