Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Millions |
Jun. 30, 2024 |
Sep. 30, 2023 |
Jun. 30, 2022 |
Sep. 30, 2021 |
|---|---|---|---|---|
| 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 | |||
| Fixed Rate (as a percent) | 1.283% | |||
| Spread Rate (as a percent) | 3.465% | |||
| Designated as Hedging Instrument | Interest Rate Swap | USD | February 2023 | ||||
| Derivative financial instruments | ||||
| Notional Amount | $ 400.0 | $ 400.0 | ||
| Fixed Rate (as a percent) | 1.283% | 1.283% |