Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Intangible Assets
Amortization of customer relationships, patents, non-competes and other intangibles	$ 49	$ 50	$ 100	$ 155
Total intangible assets, Gross Amount	6,191		6,191		$ 6,191
Finite-lived intangible assets, Accumulated Amortization	(1,007)		(1,007)		(907)
Carrying Amount	5,184		5,184		5,284
Customer relationships
Intangible Assets
Finite-Lived Intangible Assets, Gross	2,100		2,100		2,100
Finite-lived intangible assets, Accumulated Amortization	(789)		(789)		(718)
Finite-lived intangible assets, Carrying Amount	1,311		1,311		1,382
Other Intangible Assets
Intangible Assets
Finite-Lived Intangible Assets, Gross	291		291		291
Finite-lived intangible assets, Accumulated Amortization	(218)		(218)		(189)
Finite-lived intangible assets, Carrying Amount	73		73		102
Trademarks
Intangible Assets
Indefinite-lived intangible assets	$ 3,800		$ 3,800		$ 3,800