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Goodwill and Intangible Assets
9 Months Ended
Jun. 30, 2018
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, 2018:

Commercial &Infrastructure
IndustrialCommunicationsSolutionsResidentialTotal
Goodwill at September 30, 2017$7,176$-$30,886$8,631$46,693
Acquisitions (See Note 13)-2,561--2,561
Adjustments--45-45
Goodwill at June 30, 2018$7,176$2,561$30,931$8,631$49,299

Intangible Assets

Intangible assets consist of the following:

June 30, 2018
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$5,044$723$4,321
Technical library2040096304
Customer relationships6 - 1533,4697,02726,442
Backlog13,0262,565461
Construction contracts12,5832,375208
Total intangible assets$44,522$12,786$31,736

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 intangible assets$40,969$9,556$31,413