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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 117,538 | $ 58,026 |
Finite-Lived Intangible Assets, Accumulated Amortization | (31,919) | (18,669) |
Intangible Assets, Net (Excluding Goodwill) | 85,619 | 39,357 |
Amortization of Intangible Assets | 13,191 | 6,424 | $ 3,950
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 13,683 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 13,153 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 12,810 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 12,370 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 12,030 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 21,573 |  |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 15,262 | 7,754 |
Finite-Lived Intangible Assets, Accumulated Amortization | (2,891) | (1,741) |
Intangible Assets, Net (Excluding Goodwill) | $ 12,371 | $ 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 Assets, Gross | $ 400 | $ 400 |
Finite-Lived Intangible Assets, Accumulated Amortization | (161) | (141) |
Intangible Assets, Net (Excluding Goodwill) | $ 239 | $ 259 |
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 | $ 96,879 | $ 46,449 |
Finite-Lived Intangible Assets, Accumulated Amortization | (24,021) | (14,900) |
Intangible Assets, Net (Excluding Goodwill) | $ 72,858 | $ 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 Assets, Gross | $ 40 | $ 40 |
Finite-Lived Intangible Assets, Accumulated Amortization | (25) | (17) |
Intangible Assets, Net (Excluding Goodwill) | $ 15 | $ 23 |
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 | $ 4,957 | $ 3,383 |
Finite-Lived Intangible Assets, Accumulated Amortization | (4,821) | (1,870) |
Intangible Assets, Net (Excluding Goodwill) | $ 136 | $ 1,513 |
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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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