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Goodwill and Intangible Assets
6 Months Ended
Mar. 31, 2017
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, 2017:

Commercial &Infrastructure
Residential IndustrialSolutionsTotal
Goodwill at September 30, 2016$8,631$3,806$27,499$39,936
Acquisitions (See Note 13)--3,8203,820
Purchase Accounting Adjustments--(272)(272)
Goodwill at March 31, 2017$8,631$3,806$31,047$43,484

Goodwill

The adjustment to goodwill in the quarter ended March 31, 2017 relates to finalizing the deferred tax balances acquired in connection with our acquisition of Technibus, Inc.in June 2016. Please see Note 13 – Business Combinations for further discussion.

Intangible assets consist of the following:

March 31, 2017
Estimated
Useful LivesGross CarryingAccumulated
(in Years)AmountAmortizationNet
Trademarks/trade names5 - 20$4,104$271$3,833
Technical library2040071329
Customer relationships6 - 1528,6143,32525,289
Developed technology4400400-
Backlog12,1511,1331,018
Construction contracts12,1911,620571
Total$37,860$6,820$31,040

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