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Goodwill and Intangible Assets
12 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
GoodwillAndIntangibleAssetsDisclosureTextBlock

16. GOODWILL AND INTANGIBLE ASSETS

 

The following is a progression of goodwill by segment for the years ended September 30, 2016, 2015 and 2014:

CommercialInfrastructure
Residential & Industrial SolutionsTotal
Balance at September 30, 2014$8,631$-$6,362$14,993
Acquisitions "Note 18"--2,2562,256
Balance at September 30, 20158,631-8,61817,249
Acquisitions "Note 18"-3,80619,45823,264
Divestitures "Note 18"--(577)(577)
Balance at September 30, 2016$8,631$3,806$27,499$39,936

Goodwill

Based upon the results of our annual impairment analysis, the fair value of our Infrastructure Solutions and Commercial & Industrial segments exceeded the book value at September 30, 2016, and warranted no impairment. We evaluated goodwill attributable to our Residential segment qualitatively, and have concluded no impairment is indicated.

Intangible assets consist of the following:

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

September 30, 2015
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names8 - Indefinite$1,400$9$1,391
Technical library2040041359
Customer relationships8 - 123,6007882,812
Covenants not to compete314012119
Developed technology4400258142
Total$5,940$1,217$4,723

For the years ended September 30, 2016, 2015 and 2014, amortization expense of intangible assets was $2,936, $381 and $635, respectively. Our future amortization expense for years ended September 30, is as follows:

Year Ended September 30,
2017$5,050
20183,154
20192,903
20202,818
20212,714
Thereafter15,084
Total$31,723