Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Derivatives Designated as Hedging Instruments (Details)

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LONG-TERM DEBT - Derivatives Designated as Hedging Instruments (Details) - Interest Rate Swaps - Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]    
Total derivatives $ 11,309 $ 3,959
Other current assets    
Debt Instrument [Line Items]    
Assets derivatives 3,867 1,098
Other assets    
Debt Instrument [Line Items]    
Assets derivatives 7,442 2,892
Other current liabilities    
Debt Instrument [Line Items]    
Liability derivatives 0 (7)
Other liabilities    
Debt Instrument [Line Items]    
Liability derivatives $ 0 $ (24)