Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan assets	$ 766	$ 763
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(644)	(646)
Business Combination, Contingent Consideration, Liability, Noncurrent		(11)
Fair Value, Net Asset (Liability)	122	106
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value	0	11
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(11)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan assets	766	763
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(644)	(646)
Fair Value, Net Asset (Liability)	$ 122	117
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		(11)
Fair Value, Net Asset (Liability)		$ (11)