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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 3,222 |  |
Finite-Lived Intangible Asset, Useful Life | 9 years 3 months 18 days |  |
Finite-Lived Intangible Assets, Gross | $ 39,662 | $ 41,625 |
Finite-Lived Intangible Assets, Accumulated Amortization | (13,039) | (11,035) |
Intangible Assets, Net (Excluding Goodwill) | 26,623 | 30,590 |
Amortization of Intangible Assets | 3,950 | 4,101 | $ 5,766
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 3,249 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 3,422 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 2,785 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 2,240 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 11,705 |  |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 5,084 | 5,084 |
Finite-Lived Intangible Assets, Accumulated Amortization | (1,267) | (831) |
Intangible Assets, Net (Excluding Goodwill) | 3,817 | 4,253 |
Technical Library |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 400 | 400 |
Finite-Lived Intangible Assets, Accumulated Amortization | (121) | (101) |
Intangible Assets, Net (Excluding Goodwill) | 279 | 299 |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 33,539 | 33,539 |
Finite-Lived Intangible Assets, Accumulated Amortization | (11,051) | (7,870) |
Intangible Assets, Net (Excluding Goodwill) | 22,488 | 25,669 |
Noncompete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 40 | 40 |
Finite-Lived Intangible Assets, Accumulated Amortization | (9) | (1) |
Intangible Assets, Net (Excluding Goodwill) | 31 | 39 |
Construction Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 599 | 2,562 |
Finite-Lived Intangible Assets, Accumulated Amortization | (591) | (2,232) |
Intangible Assets, Net (Excluding Goodwill) | $ 8 | $ 330 |

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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=118932676&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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