Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Revolving loan	$ 40,339	$ 12
Other long-term debt	63	205
Long-term debt	39,746	217
Debt Issuance Costs, Noncurrent, Net	656	736
Letters of Credit Outstanding, Amount	4,527
Line of Credit Facility, Remaining Borrowing Capacity	$ 55,134
Line of Credit Facility, Interest Rate at Period End	1.38%
Interest expense	$ 962	$ 777	$ 1,857
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Liquidity	$ 78,239
Fixed Charge Coverage Ratio	12.0
Debt Instrument, Covenant Compliance	20,000