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Goodwil and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 41,625 | $ 41,625
Accumulated Amortization | 13,166 | 11,035
Intangible assets, net | 28,459 | 30,590
Trademarks And Trade Names [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | 5,084 | 5,084
Accumulated Amortization | 1,053 | 831
Intangible assets, net | $ 4,031 | $ 4,253
Trademarks And Trade Names [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 20 years | 20 years
Trademarks And Trade Names [Member] | Minimum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 5 years | 5 years
Technical Library [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 20 years | 20 years
Gross Carrying Amount | $ 400 | $ 400
Accumulated Amortization | 111 | 101
Intangible assets, net | 289 | 299
Customer Relationships [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | 33,539 | 33,539
Accumulated Amortization | 9,460 | 7,870
Intangible assets, net | $ 24,079 | $ 25,669
Customer Relationships [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 15 years | 15 years
Customer Relationships [Member] | Minimum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 6 years | 6 years
Backlog [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 1 year | 1 year
Gross Carrying Amount | $ 378 | $ 378
Accumulated Amortization | 358 | 176
Intangible assets, net | $ 20 | $ 202
Non-competition arrangments [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 1 year | 1 year
Gross Carrying Amount | $ 40 | $ 40
Accumulated Amortization | 5 | 1
Intangible assets, net | $ 35 | $ 39
Construction Contract Value [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 1 year | 1 year
Gross Carrying Amount | $ 2,184 | $ 2,184
Accumulated Amortization | 2,179 | 2,056
Intangible assets, net | $ 5 | $ 128

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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