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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

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