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Debt - Interest Rate Contracts (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swap contracts |  |  |
Derivative [Line Items] |  |  |
Pay fixed swaps - notional amount | $ 331,250,000 | $ 343,750,000 |
Net unrealized gain | $ 4,791,000 | $ 11,309,000 |
Weighted-average maturity period (years) | 2 years 2 months 30 days | 2 years 8 months 24 days |
Weighted-average received rate (as a percent) | 2.49% | 2.26% |
Weighted-average pay rate (as a percent) | 1.40% | 1.37% |
Securitization Facility |  |  |
Derivative [Line Items] |  |  |
Interest rate on facility (as a percent) | 3.24% |  | 2.63%

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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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