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Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Executive Savings Plan assets $ 986 $ 783  
Financial and Nonfinancial Liabilities, Fair Value Disclosure (852) (657)  
Business Combination, Contingent Consideration, Liability, Noncurrent (3,468) (4,465)  
Equity Securities 31,639    
Debt Securities, Trading 3,364    
Equity Securities, FV-NI, Unrealized Gain (Loss) 1,492 0 $ 0
Debt Securities, Trading, Unrealized Gain (Loss) 297 0 0
Debt and Equity Securities, Unrealized Gain (Loss) 1,789 0 0
Fair Value, Net Asset (Liability) 31,669 (4,339)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value (3,468) (4,465) $ (4,323)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 2,790    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) $ 713 $ 142  
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, Settlements $ (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 986 $ 783  
Financial and Nonfinancial Liabilities, Fair Value Disclosure (852) (657)  
Equity Securities 31,639    
Debt Securities, Trading 3,364    
Fair Value, Net Asset (Liability) 35,137 126  
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 (3,468) (4,465)  
Fair Value, Net Asset (Liability) $ (3,468) $ (4,465)