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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 111,445 | $ 111,445
Finite-Lived Intangible Assets, Accumulated Amortization | (58,304) | (55,237)
Intangible Assets, Net (Excluding Goodwill) | 53,141 | 56,208
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 14,621 | 14,621
Finite-Lived Intangible Assets, Accumulated Amortization | (7,349) | (6,973)
Intangible Assets, Net (Excluding Goodwill) | $ 7,272 | $ 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 | (206) | (201)
Intangible Assets, Net (Excluding Goodwill) | 194 | 199
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 91,426 | 91,426
Finite-Lived Intangible Assets, Accumulated Amortization | (45,751) | (43,065)
Intangible Assets, Net (Excluding Goodwill) | $ 45,675 | $ 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 | $ 4,958 | $ 4,958
Finite-Lived Intangible Assets, Accumulated Amortization | (4,958) | (4,958)
Intangible Assets, Net (Excluding Goodwill) | $ 0 | $ 0

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