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Derivative Financial Instruments and Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2019
Derivative Financial Instruments and Fair Value Measurements |
Summary of effect of derivative instruments not designated as hedging instruments on income | ​
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September 30, 2019
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ |  | 200.0 |  | 2.19 | % | February 2021
CAD | ​ | ​ | 400.0 | ​ | 2.49 | % | September 2022
USD | ​ | ​ | 200.0 | ​ | 2.60 | % | February 2023
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2018
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ |  | 200.0 |  | 2.19 | % | February 2021
CAD | ​ | ​ | 400.0 | ​ | 2.49 | % | September 2022
USD | ​ | ​ | 200.0 | ​ | 2.60 | % | February 2023
​

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- Definition Disclosure information pertaining to derivative instruments and fair value measurements. + References No definition available. + Details
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- Definition Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 + Details
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