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DISCONTINUED OPERATIONS (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2008
unit
Nov. 16, 2017
USD ($)
Nov. 15, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of units sold | unit       11    
Number of closed units | unit       1    
Number of merged units | unit       2    
Environmental exit costs, costs accrued to date   $ 5,700        
Plastics [Member] | Discontinued Operations, Held-for-sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal group, including discontinued operation, consideration         $ 475,000 $ 475,000
Gain on sale of business $ 112,964 $ 0 $ 0      
Gain on sale of business net of tax 81,041          
Stay and transaction bonuses and other accrued liabilities $ 9,858