Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 83,772	$ 58,026
Finite-Lived Intangible Assets, Accumulated Amortization	(20,949)	(18,669)
Intangible Assets, Net (Excluding Goodwill)	62,823	39,357
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	18,451	7,754
Finite-Lived Intangible Assets, Accumulated Amortization	(1,898)	(1,741)
Intangible Assets, Net (Excluding Goodwill)	$ 16,553	$ 6,013
Trademarks and Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Trademarks and Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Technical Library
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Finite-Lived Intangible Assets, Gross	$ 400	$ 400
Finite-Lived Intangible Assets, Accumulated Amortization	(146)	(141)
Intangible Assets, Net (Excluding Goodwill)	254	259
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	59,641	46,449
Finite-Lived Intangible Assets, Accumulated Amortization	(15,986)	(14,900)
Intangible Assets, Net (Excluding Goodwill)	$ 43,655	$ 31,549
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years	6 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Finite-Lived Intangible Assets, Gross	$ 40	$ 40
Finite-Lived Intangible Assets, Accumulated Amortization	(19)	(17)
Intangible Assets, Net (Excluding Goodwill)	$ 21	$ 23
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross	$ 5,240	$ 3,383
Finite-Lived Intangible Assets, Accumulated Amortization	(2,900)	(1,870)
Intangible Assets, Net (Excluding Goodwill)	$ 2,340	$ 1,513