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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
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Mar. 31, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |
Pay fixed swaps - notional amount | $ 350,000 | $ 293,750
Net unrealized loss | $ (6,032) | $ (534)
Weighted-average maturity period (years) | 2 years 9 months 18 days | 1 year 10 months 24 days
Weighted-average received rate (as a percent) | 0.99% | 2.02%
Weighted-average pay rate (as a percent) | 1.32% | 1.41%

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