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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years 4 months 24 days |
Finite-Lived Intangible Assets, Gross |  | $ 58,786 | $ 39,662
Finite-Lived Intangible Assets, Accumulated Amortization |  | (16,594) | (13,039)
Intangible Assets, Net (Excluding Goodwill) |  | 42,192 | 26,623
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 7,754 | 5,084
Finite-Lived Intangible Assets, Accumulated Amortization |  | (1,593) | (1,267)
Intangible Assets, Net (Excluding Goodwill) |  | $ 6,161 | 3,817
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 |  | (136) | (121)
Intangible Assets, Net (Excluding Goodwill) |  | 264 | 279
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross |  | 46,269 | 33,539
Finite-Lived Intangible Assets, Accumulated Amortization |  | (13,797) | (11,051)
Intangible Assets, Net (Excluding Goodwill) |  | $ 32,472 | 22,488
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 |  | $ 1,300 | 40
Finite-Lived Intangible Assets, Accumulated Amortization |  | (59) | (9)
Intangible Assets, Net (Excluding Goodwill) |  | $ 1,241 | 31
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year | 1 year |
Finite-Lived Intangible Assets, Gross |  | $ 3,063 | 599
Finite-Lived Intangible Assets, Accumulated Amortization |  | (1,009) | (591)
Intangible Assets, Net (Excluding Goodwill) |  | $ 2,054 | $ 8
Construction Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year |

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