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Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Derivative financial instruments |  |  |  |
Fixed Rate (as a percent) | 1.283% |  |  |
Interest Rate Cap |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  |  | $ 300.0 |
Interest Rate Cap | Maximum |  |  |  |
Derivative financial instruments |  |  |  |
Fixed Rate (as a percent) |  |  | 3.465% |
Interest Rate Swap |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  |  |  | $ 400.0
Spread Rate (as a percent) |  |  | 3.465% |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | March 2018 |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  | $ 200.0 |  |
Fixed Rate (as a percent) |  | 2.60% |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | February 2023 |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount | $ 400.0 | $ 400.0 |  |
Fixed Rate (as a percent) | 1.283% | 1.349% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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