Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Loss Recognized on Derivatives (Details)

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LONG-TERM DEBT - Loss Recognized on Derivatives (Details) - Cash Flow Hedging - Interest Rate Swaps - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Interest Expense      
Debt Instrument [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives $ 1,752 $ (3,146) $ (3,922)
Amount of Gain (Loss) Reclassified from AOCI into Income(Effective Portion) 1,069 (1,919) (2,392)
Other Comprehensive Income (Loss)      
Debt Instrument [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives $ 7,043 $ (3,230) $ (4,841)