Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Intangible Assets
Amortization of customer relationships, patents, non-competes and other intangibles	$ 115	$ 49	$ 231	$ 100
Total intangible assets, Gross Amount	6,887		6,887		$ 6,191
Finite-lived intangible assets, Accumulated Amortization	(1,075)		(1,075)		(1,135)
Carrying Amount	5,812		5,812		5,056
Customer relationships
Intangible Assets
Finite-Lived Intangible Assets, Gross	2,100		2,100		2,100
Finite-lived intangible assets, Accumulated Amortization	(927)		(927)		(858)
Finite-lived intangible assets, Carrying Amount	1,173		1,173		1,242
Other Intangible Assets
Intangible Assets
Finite-Lived Intangible Assets, Gross	987		987		291
Finite-lived intangible assets, Accumulated Amortization	(148)		(148)		(277)
Finite-lived intangible assets, Carrying Amount	839		839		14
Trademarks
Intangible Assets
Indefinite-lived intangible assets	$ 3,800		$ 3,800		$ 3,800