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Goodwill and Intangible Assets
12 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]
17. GOODWILL AND INTANGIBLE ASSETS

 
Goodwill

The following summarizes changes in the carrying value of goodwill by segment for the years ended September 30, 2022 and 2021:
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialTotal
Balance at September 30, 2020$2,816 $16,219 $34,728 $— $53,763 
Acquisitions (Note 19)— 35,151 3,481 — 38,632 
Balance at September 30, 20212,816 51,370 38,209 — 92,395 
Balance at September 30, 2022$2,816 $51,370 $38,209 $— $92,395 

Based on the results of our annual goodwill impairment assessment at September 30, 2022, we concluded the fair value of each of our reporting units exceeded its book value, and therefore we recorded no impairment charges for the year ended September 30, 2022.

We have an accumulated impairment loss of $6,976 related to our Commercial & Industrial segment.

Intangible Assets

Intangible assets consist of the following:
September 30, 2022
Estimated Useful Lives (in Years)Gross Carrying AmountAccumulated AmortizationNet
Trademarks/trade names5-20$15,262 $(4,589)$10,673 
Technical library20400 (181)219 
Customer relationships6-1596,699 (35,662)61,037 
Non-competition arrangements540 (33)
Backlog and construction contracts14,958 (4,958)— 
Total$117,359 $(45,423)$71,936 

September 30, 2021
Estimated Useful Lives (in Years)Gross Carrying AmountAccumulated AmortizationNet
Trademarks/trade names5-20$15,262 $(2,891)$12,371 
Technical library20400 (161)239 
Customer relationships6-1596,879 (24,021)72,858 
Non-competition arrangements540 (25)15 
Backlog and construction contracts14,957 (4,821)136 
Total$117,538 $(31,919)$85,619 
For the years ended September 30, 2022, 2021, and 2020, amortization expense of intangible assets was $13,666, $13,191 and $6,424, respectively. Our estimated future amortization expense for years ending September 30 is as follows:

Year Ending September 30,
2023$13,153 
202412,810 
202512,370 
202612,031 
20278,631 
Thereafter12,941 
Total$71,936