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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Level 3 |  |
Derivative financial instruments |  |
Fair value of contingent consideration liability | $ 11,000,000 | $ 11,000,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements |  |
Derivative financial instruments |  |
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion) | $ 0 |

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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 (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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