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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 117,359 | $ 117,538 |
Finite-Lived Intangible Assets, Accumulated Amortization | (45,423) | (31,919) |
Intangible Assets, Net (Excluding Goodwill) | 71,936 | 85,619 |
Amortization of Intangible Assets | 13,666 | 13,191 | $ 6,424
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 13,153 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 12,810 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 12,370 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 12,031 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 8,631 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 12,941 |  |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 15,262 | 15,262 |
Finite-Lived Intangible Assets, Accumulated Amortization | (4,589) | (2,891) |
Intangible Assets, Net (Excluding Goodwill) | $ 10,673 | $ 12,371 |
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 Assets, Gross | $ 400 | $ 400 |
Finite-Lived Intangible Assets, Accumulated Amortization | (181) | (161) |
Intangible Assets, Net (Excluding Goodwill) | $ 219 | $ 239 |
Technical Library | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years | 20 years |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 96,699 | $ 96,879 |
Finite-Lived Intangible Assets, Accumulated Amortization | (35,662) | (24,021) |
Intangible Assets, Net (Excluding Goodwill) | $ 61,037 | $ 72,858 |
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 Assets, Gross | $ 40 | $ 40 |
Finite-Lived Intangible Assets, Accumulated Amortization | (33) | (25) |
Intangible Assets, Net (Excluding Goodwill) | $ 7 | $ 15 |
Noncompete Agreements [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years | 5 years |
Construction Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 4,958 | $ 4,957 |
Finite-Lived Intangible Assets, Accumulated Amortization | (4,958) | (4,821) |
Intangible Assets, Net (Excluding Goodwill) | $ 0 | $ 136 |
Construction Contracts [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year | 1 year |

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