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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]
11. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following summarizes changes in the carrying value of goodwill by segment for the three months ended December 31, 2020:

CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialTotal
Goodwill at September 30, 2020$2,816 $16,219 $34,728 $— $53,763 
Acquisitions— 28,121 4,565 — 32,686 
Goodwill at December 31, 2020$2,816 $44,340 $39,293 $— $86,449 

Intangible Assets

Intangible assets consist of the following:
Estimated Useful Lives (in Years)December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet
Trademarks/trade names5-20$18,451 $(1,898)$16,553 
Technical library20400 (146)254 
Customer relationships6-1559,641 (15,986)43,655 
Non-competition arrangements540 (19)21 
Backlog and construction contracts15,240 (2,900)2,340 
Total intangible assets$83,772 $(20,949)$62,823 
Estimated Useful Lives (in Years)September 30, 2020
Gross Carrying AmountAccumulated AmortizationNet
Trademarks/trade names5-20$7,754 $(1,741)$6,013 
Technical library20400 (141)259 
Customer relationships6-1546,449 (14,900)31,549 
Non-competition arrangements540 (17)23 
Backlog and construction contracts13,383 (1,870)1,513 
Total intangible assets$58,026 $(18,669)$39,357