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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 97,970	$ 58,026
Finite-Lived Intangible Assets, Accumulated Amortization	(24,645)	(18,669)
Intangible Assets, Net (Excluding Goodwill)	73,325	39,357
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	12,194	7,754
Finite-Lived Intangible Assets, Accumulated Amortization	(2,236)	(1,741)
Intangible Assets, Net (Excluding Goodwill)	$ 9,958	$ 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	(151)	(141)
Intangible Assets, Net (Excluding Goodwill)	249	259
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	80,379	46,449
Finite-Lived Intangible Assets, Accumulated Amortization	(18,486)	(14,900)
Intangible Assets, Net (Excluding Goodwill)	$ 61,893	$ 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	(21)	(17)
Intangible Assets, Net (Excluding Goodwill)	$ 19	$ 23
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross	$ 4,957	$ 3,383
Finite-Lived Intangible Assets, Accumulated Amortization	(3,751)	(1,870)
Intangible Assets, Net (Excluding Goodwill)	$ 1,206	$ 1,513

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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