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Goodwill and Intangible Assets
6 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Intangible Assets Disclosure

11. GOODWILL AND INTANGIBLE ASSETS

The following is a progression of goodwill by segment for the six months ended March 31, 2016:

Commercial &Infrastructure
Residential IndustrialSolutionsTotal
Goodwill at September 30, 2015$8,631$-$8,618$17,249
Acquisitions "Note 13"-6051,4662,071
Divestitures "Note 13"--(577)(577)
Goodwill at March 31, 2016$8,631$605$9,507$18,743

Goodwill

We evaluate goodwill for potential impairment at least annually at year end, however, if impairment indicators exist, we will evaluate as needed. Events affecting the composition of a reporting unit, such as a sale or disposal, can be an indication of a potential impairment. As such, after allocating $577 of goodwill to a disposal group within our Infrastructure Solutions reporting unit, we considered whether it was more likely than not that the fair value of the reporting unit was less than its carrying amount. Based on the results of this analysis, no impairment was indicated.

Intangible assets consist of the following:

March 31, 2016
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names8 - Indefinite$1,754$44$1,710
Technical library2040051349
Customer relationships8 - 156,5241,1545,370
Covenants not to compete3140140-
Developed technology440030892
Backlog1321107214
Construction contracts1227103124
Total$9,766$1,907$7,859

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