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Debt - Interest Rate Contracts (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swap contracts - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |
Pay fixed swaps - notional amount | $ 250,000 | $ 312,500
Net unrealized loss | $ (2,905) | $ (7,792)
Weighted-average maturity period (years) | 2 years 8 months 12 days | 2 years 7 months 6 days
Weighted-average received rate (as a percent) | 0.11% | 0.15%
Weighted-average pay rate (as a percent) | 1.34% | 1.34%

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