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LONG-TERM DEBT - Loss Recognized on Derivatives (Details) - Cash Flow Hedging - Interest Rate Swaps - USD ($) $ in Thousands | 12 Months Ended
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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)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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