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DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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