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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 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 three months ended December 31, 2017:

Commercial &Infrastructure
IndustrialSolutionsResidentialTotal
Goodwill at September 30, 2017$7,176$30,886$8,631$46,693
Adjustments-45-45
Goodwill at December 31, 2017$7,176$30,931$8,631$46,738

Intangible Assets

Intangible assets consist of the following:

December 31, 2017
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$4,643$531$4,112
Technical library2040086314
Customer relationships6 - 1531,2295,46125,768
Backlog12,4122,412-
Construction contracts12,3992,141258
Total$41,083$10,631$30,452

September 30, 2017
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$4,643$440$4,203
Technical library2040081319
Customer relationships6 - 1531,1154,74126,374
Backlog12,4122,130282
Construction contracts12,3992,164235
Total$40,969$9,556$31,413