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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
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
Schedule of Finite-Lived Intangible Assets [Table Text Block]
 
 
 
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
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
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