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Debt - Interest Rate Contracts (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swap contracts - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019
Derivative [Line Items] |  |
Pay fixed swaps - notional amount | $ 287,500 | $ 293,750
Net unrealized loss | $ (149) | $ (534)
Weighted-average maturity period (years) | 1 year 8 months 12 days | 1 year 10 months 24 days
Weighted-average received rate (as a percent) | 1.76% | 2.02%
Weighted-average pay rate (as a percent) | 1.43% | 1.41%

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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