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Debt - Interest Rate Contracts (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swap contracts - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |
Pay fixed swaps - notional amount | $ 250,000 | $ 312,500
Net unrealized loss | $ (2,982) | $ (7,792)
Weighted-average maturity period (years) | 2 years 6 months | 2 years 7 months 6 days
Weighted-average received rate (as a percent) | 0.10% | 0.15%
Weighted-average pay rate (as a percent) | 1.34% | 1.34%

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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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