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Fair Value Measurements and Interest Rate Swaps - Recurring Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred Compensation Plan Assets | $ 19,535 | $ 18,179
Deferred Compensation Liability, Classified, Noncurrent | 19,535 | 18,179
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized gains on interest rate swaps | 11,453 | 16,213
Derivative Asset, Current | $ 0 | $ 1,905

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