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Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Executive Savings Plan assets $ 1,120 $ 986  
Financial and Nonfinancial Liabilities, Fair Value Disclosure (984) (852)  
Business Combination, Contingent Consideration, Liability, Noncurrent (2,113) (3,468)  
Equity Securities 104,587 31,639  
Debt Securities, Trading 0 3,364  
Debt Securities, Trading, and Equity Securities, FV-NI 104,587 35,003  
Equity Securities, FV-NI, Unrealized Gain (Loss) 7,485 1,492 $ 0
Debt Securities, Trading, Unrealized Gain (Loss) 0 297 0
Debt and Equity Securities, Unrealized Gain (Loss) 7,485 1,789 0
Fair Value, Net Asset (Liability) 102,610 31,669  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ (2,113) (3,468) $ (4,465)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   $ 2,790  
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Contingent consideration Contingent consideration  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ 1,145 $ 713  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (2,500) (4,500)  
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Executive Savings Plan assets 1,120 986  
Financial and Nonfinancial Liabilities, Fair Value Disclosure (984) (852)  
Equity Securities 104,587 31,639  
Debt Securities, Trading   3,364  
Fair Value, Net Asset (Liability) 104,723 35,137  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability, Noncurrent (2,113) (3,468)  
Fair Value, Net Asset (Liability) $ (2,113) $ (3,468)