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Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |
Goodwill | $ 50,702 | $ 46,693
Goodwill, Acquired During Period |  | 4,240
Goodwill, Written off Related to Sale of Business Unit | (119) |
Goodwill, Purchase Accounting Adjustments | 39 | (231)
Goodwill | 50,622 | 50,702
Commercial and Industrial [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 6,976 | 7,176
Goodwill, Acquired During Period |  | 0
Goodwill, Written off Related to Sale of Business Unit | 0 |
Goodwill, Purchase Accounting Adjustments | 0 | (200)
Goodwill | 6,976 | 6,976
Residential [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 9,979 | 8,631
Goodwill, Acquired During Period |  | 1,348
Goodwill, Written off Related to Sale of Business Unit | 0 |
Goodwill, Purchase Accounting Adjustments | 39 | 0
Goodwill | 10,018 | 9,979
Infrastructure Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 30,931 | 30,886
Goodwill, Acquired During Period |  | 0
Goodwill, Written off Related to Sale of Business Unit | (119) |
Goodwill, Purchase Accounting Adjustments | 0 | 45
Goodwill | 30,812 | 30,931
Communications [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 2,816 | 0
Goodwill, Acquired During Period |  | 2,892
Goodwill, Written off Related to Sale of Business Unit | 0 |
Goodwill, Purchase Accounting Adjustments | 0 | (76)
Goodwill | $ 2,816 | $ 2,816

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