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