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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 111,205	$ 111,445
Finite-Lived Intangible Assets, Accumulated Amortization	(61,697)	(55,237)
Intangible Assets, Net (Excluding Goodwill)	49,508	56,208
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	13,821	14,621
Finite-Lived Intangible Assets, Accumulated Amortization	(6,568)	(6,973)
Intangible Assets, Net (Excluding Goodwill)	$ 7,253	$ 7,648
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	(216)	(201)
Intangible Assets, Net (Excluding Goodwill)	184	199
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	92,926	91,426
Finite-Lived Intangible Assets, Accumulated Amortization	(51,497)	(43,065)
Intangible Assets, Net (Excluding Goodwill)	$ 41,429	$ 48,361
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	(40)	(40)
Intangible Assets, Net (Excluding Goodwill)	$ 0	$ 0
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross	$ 4,018	$ 4,958
Finite-Lived Intangible Assets, Accumulated Amortization	(3,376)	(4,958)
Intangible Assets, Net (Excluding Goodwill)	$ 642	$ 0

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

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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