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Goodwill and Intangible Assets
 12 Months Ended
Sep. 30, 2019
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, 2019 and 2018:
 
Commercial & Industrial
 
Communications
 
Infrastructure Solutions
 
Residential
 
Total
Balance at September 30, 2017
$
7,176

 
$
—

 
$
30,886

 
$
8,631

 
$
46,693

Acquisitions (Note 19)
—

 
2,892

 
—

 
1,348

 
4,240

Purchase accounting adjustments
(200
)
 
(76
)
 
45

 
—

 
(231
)
Balance at September 30, 2018
6,976

 
2,816

 
30,931

 
9,979

 
50,702

Divestitures
—

 
—

 
(119
)
 
—

 
(119
)
Purchase accounting adjustments
—

 
—

 
—

 
39

 
39

Balance at September 30, 2019
$
6,976

 
$
2,816

 
$
30,812

 
$
10,018

 
$
50,622



Based upon the results of our annual impairment assessment, the fair value of our each of our four segments exceeded the book value at September 30, 2019, and warranted no impairment.

Intangible Assets

Intangible assets consist of the following:
 
 
 
September 30, 2019
 
Estimated Useful Lives (in Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Trademarks/trade names
5 - 20
 
$
5,084

 
$
(1,267
)
 
$
3,817

Technical library
20
 
400

 
(121
)
 
279

Customer relationships
6 - 15
 
33,539

 
(11,051
)
 
22,488

Non-competition arrangements
5
 
40

 
(9
)
 
31

Backlog and construction contracts
1
 
599

 
(591
)
 
8

Total
 
 
$
39,662

 
$
(13,039
)
 
$
26,623


 
 
 
September 30, 2018
 
Estimated Useful Lives (in Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Trademarks/trade names
5 - 20
 
$
5,084

 
$
(831
)
 
$
4,253

Technical library
20
 
400

 
(101
)
 
299

Customer relationships
6 - 15
 
33,539

 
(7,870
)
 
25,669

Non-competition arrangements
5
 
40

 
(1
)
 
39

Backlog and construction contracts
1
 
2,562

 
(2,232
)
 
330

Total
 
 
$
41,625

 
$
(11,035
)
 
$
30,590



For the years ended September 30, 2019, 2018, and 2017, amortization expense of intangible assets was $3,950, $4,101 and $5,766, respectively. The weighted average useful life of our intangible assets at September 30, 2019, was 9.3 years. Our estimated future amortization expense for years ended September 30 is as follows:
Year Ended September 30,
2020
$
3,222

2021
3,249

2022
3,422

2023
2,785

2024
2,240

Thereafter
11,705

Total
$
26,623