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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Financial assets (liabilities) measured at fair value on a recurring basis as of December 31, 2023 and September 30, 2023, are summarized in the following tables by the type of inputs applicable to the fair value measurements:
December 31, 2023
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable Inputs (Level 3)
Executive savings plan assets$851 $851 $— 
Debt securities
4,501 4,501 — 
Executive savings plan liabilities(729)(729)— 
Total$4,623 $4,623 $— 

September 30, 2023
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable Inputs (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 $(4,465)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation The table below presents the change in fair value of this obligation, which used significant unobservable inputs (Level 3). This obligation was settled during the three months ended December 31, 2023, and we did not have any other assets or liabilities measured using significant unobservable inputs at December 31, 2023.
Contingent Consideration Agreements
Fair value at September 30, 2023$(4,465)
Net adjustments to fair value(35)
Settlements4,500 
Fair value at December 31, 2023$—