Fair Value Measurements and Interest Rate Swaps - Recurring Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	$ 18,179	$ 14,075
Deferred Compensation Liability, Classified, Noncurrent	18,179	14,075
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains on interest rate swaps	16,213	34,854
Derivative Asset, Current	$ 1,905	$ 0