Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	March 31, 2021
			Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable Inputs (Level 3)
Executive savings plan assets		$	892	$	892	$	—
Executive savings plan liabilities			(765)		(765)		—
Contingent consideration			4,147		—		4,147
Total		$	4,274	$	127	$	4,147

	September 30, 2020
			Total Fair Value		Quoted 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 March 31, 2021	$	4,147