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Goodwill and Intangible Assets
9 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Intangible Assets Disclosure

11. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following is a progression of goodwill by segment for the nine months ended June 30, 2017:

Commercial &Infrastructure
Residential IndustrialSolutionsTotal
Goodwill at September 30, 2016$8,631$3,806$27,499$39,936
Acquisitions (See Note 13)-1,6403,8205,460
Divestitures--(51)(51)
Adjustments-(41)(271)(312)
Goodwill at June 30, 2017$8,631$5,405$30,997$45,033

The adjustment to goodwill in the nine months ended June 30, 2017, relates primarily to finalizing the deferred tax balances acquired in connection with our acquisitions of Technibus and STR. Please see Note 13 – Business Combinations for further discussion.

Intangible Assets

Intangible assets consist of the following:

June 30, 2017
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$4,374$350$4,024
Technical library2040076324
Customer relationships6 - 1530,2844,01526,269
Developed technology4400400-
Backlog12,1511,614537
Construction contracts12,1911,845346
Total$39,800$8,300$31,500

September 30, 2016
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$3,845$139$3,706
Technical library2040061339
Customer relationships6 - 1527,4142,00325,411
Developed technology440035842
Backlog11,6215451,076
Construction contracts12,1911,0421,149
Total$35,871$4,148$31,723