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Goodwil and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2016
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 39,800 | $ 35,871
Accumulated Amortization | 8,300 | 4,148
Intangible assets, net | 31,500 | 31,723
Trademarks And Trade Names [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | 4,374 | 3,845
Accumulated Amortization | 350 | 139
Intangible assets, net | $ 4,024 | $ 3,706
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] |  |
Gross Carrying Amount | $ 400 | $ 400
Accumulated Amortization | 76 | 61
Intangible assets, net | $ 324 | $ 339
Technical Library [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 20 years | 20 years
Customer Relationships [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 30,284 | $ 27,414
Accumulated Amortization | 4,015 | 2,003
Intangible assets, net | $ 26,269 | $ 25,411
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
Developed Technology [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 400 | $ 400
Accumulated Amortization | 400 | 358
Intangible assets, net | $ 0 | $ 42
Developed Technology [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 4 years | 4 years
Order Backlog [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 2,151 | $ 1,621
Accumulated Amortization | 1,614 | 545
Intangible assets, net | $ 537 | $ 1,076
Order Backlog [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 1 year | 1 year
Construction Contract Value [Member] |  |
IntangibleAssets [Line Items] |  |
Gross Carrying Amount | $ 2,191 | $ 2,191
Accumulated Amortization | 1,845 | 1,042
Intangible assets, net | $ 346 | $ 1,149
Construction Contract Value [Member] | Maximum [Member] |  |
IntangibleAssets [Line Items] |  |
Estimated Useful Lives | 1 year | 1 year

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