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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
June 30, 2021
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable Inputs (Level 3)
Executive savings plan assets$945 $945 $— 
Executive savings plan liabilities(814)(814)— 
Contingent consideration liability(4,147)— (4,147)
Total$(4,016)$131 $(4,147)
September 30, 2020
Total Fair ValueQuoted Prices (Level 1)Significant Unobservable Inputs (Level 3)
Executive savings plan assets$766 $766 $— 
Executive savings plan liabilities(644)(644)— 
Total$122 $122 $— 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Contingent Consideration Agreements
Fair value at September 30, 2020$— 
Acquisitions(4,074)
Net adjustments to fair value(73)
Fair value at June 30, 2021$(4,147)