Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Intangible Assets
Useful life	15 years
Goodwill impairment charges	$ 0	$ 0	$ 0
Change to goodwill	0	0	0
Amortization of customer relationships, patents, non-competes and other intangibles	780	467	$ 228
Total intangible assets, Gross Amount	7,000	6,897
Finite-lived intangible assets, Accumulated Amortization	(2,091)	(1,311)
Carrying Amount	4,909	5,586
Customer relationships
Intangible Assets
Finite-lived intangible assets Gross Amount	2,100	2,100
Finite-lived intangible assets, Accumulated Amortization	(1,128)	(995)
Finite-lived intangible assets, Carrying Amount	972	1,105
Other Intangible Assets
Intangible Assets
Finite-lived intangible assets Gross Amount	1,100	997
Finite-lived intangible assets, Accumulated Amortization	(963)	(316)
Finite-lived intangible assets, Carrying Amount	137	681
Trademarks
Intangible Assets
Indefinite-lived intangible assets	$ 3,800	3,800
Finite-lived intangible assets, Carrying Amount		$ 3,800