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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 276,043 | $ 243,842 |
Cost of services | 225,828 | 202,241 |
Gross profit | 50,215 | 41,601 |
Selling, general and administrative expenses | 37,872 | 32,086 |
Contingent consideration | 0 | 34 |
Loss (gain) on sale of assets | (36) | (3) |
Operating income (loss) | 12,379 | 9,484 |
Depreciation and amortization expense | 2,362 | 2,372 |
Capital expenditures | 1,391 | 2,088 |
Total assets | 469,865 | 423,137 | $ 445,258
Commercial and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 67,743 | 72,583 |
Cost of services | 61,008 | 63,908 |
Gross profit | 6,735 | 8,675 |
Selling, general and administrative expenses | 7,288 | 6,716 |
Contingent consideration |  | 0 |
Loss (gain) on sale of assets | (27) | (3) |
Operating income (loss) | (526) | 1,962 |
Depreciation and amortization expense | 676 | 626 |
Capital expenditures | 460 | 852 |
Total assets | 80,612 | 78,924 |
Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 84,289 | 69,325 |
Cost of services | 68,722 | 57,359 |
Gross profit | 15,567 | 11,966 |
Selling, general and administrative expenses | 8,569 | 6,934 |
Contingent consideration |  | 0 |
Loss (gain) on sale of assets | (9) | 0 |
Operating income (loss) | 7,007 | 5,032 |
Depreciation and amortization expense | 337 | 415 |
Capital expenditures | 282 | 500 |
Total assets | 113,574 | 88,534 |
Infrastructure Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 31,283 | 29,479 |
Cost of services | 23,513 | 23,552 |
Gross profit | 7,770 | 5,927 |
Selling, general and administrative expenses | 4,493 | 4,481 |
Contingent consideration |  | 34 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | 3,277 | 1,412 |
Depreciation and amortization expense | 1,120 | 1,094 |
Capital expenditures | 437 | 187 |
Total assets | 112,413 | 114,475 |
Residential [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 92,728 | 72,455 |
Cost of services | 72,585 | 57,422 |
Gross profit | 20,143 | 15,033 |
Selling, general and administrative expenses | 13,720 | 11,137 |
Contingent consideration |  | 0 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | 6,423 | 3,896 |
Depreciation and amortization expense | 210 | 209 |
Capital expenditures | 212 | 447 |
Total assets | 77,109 | 55,352 |
Corporate Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 |
Cost of services | 0 | 0 |
Gross profit | 0 | 0 |
Selling, general and administrative expenses | 3,802 | 2,818 |
Contingent consideration |  | 0 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | (3,802) | (2,818) |
Depreciation and amortization expense | 19 | 28 |
Capital expenditures | 0 | 102 |
Total assets | $ 86,157 | $ 85,852 |

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