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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
September 30, 2024
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable (Level 3)
Equity securities$31,639 $31,639 $— 
Debt securities classified as trading securities3,364 3,364 — 
Executive savings plan assets986 986 — 
Executive savings plan liabilities(852)(852)— 
Contingent consideration liability(3,468)— (3,468)
Total$31,669 $35,137 $(3,468)
September 30, 2023
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable (Level 3)
Executive savings plan assets$783 $783 $— 
Executive savings plan liabilities(657)(657)— 
Contingent consideration liability(4,465)— (4,465)
Total$(4,339)$126 $(4,465)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Contingent Consideration Agreement
Fair value at September 30, 2022$(4,323)
Net adjustments to fair value(142)
Fair value at September 30, 2023$(4,465)
Acquisitions(2,790)
Net adjustments to fair value(713)
Settlements4,500 
Fair value at September 30, 2024$(3,468)