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Debt and Financing Arrangements - Interest Rate Contracts (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swap contracts - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Sep. 30, 2021
Derivative [Line Items] |  |
Pay fixed swaps - notional amount | $ 225,000 | $ 250,000
Net unrealized gain (loss) | $ 5,318 | $ (2,062)
Weighted-average maturity period (years) | 1 year 10 months 24 days | 2 years 2 months 12 days
Weighted-average received rate (as a percent) | 0.45% | 0.08%
Weighted-average pay rate (as a percent) | 1.37% | 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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