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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 314,838 | $ 276,043 |
Cost of services | 256,159 | 225,828 |
Gross profit | 58,679 | 50,215 |
Selling, general and administrative expenses | 42,786 | 37,872 |
Loss (gain) on sale of assets | (10) | (36) |
Operating income (loss) | 15,903 | 12,379 |
Depreciation and amortization expense | 4,020 | 2,362 |
Capital expenditures | 1,182 | 1,391 |
Total assets | 609,370 | 469,865 | $ 560,528
Commercial and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 62,590 | 67,743 |
Cost of services | 56,915 | 61,008 |
Gross profit | 5,675 | 6,735 |
Selling, general and administrative expenses | 6,424 | 7,288 |
Loss (gain) on sale of assets | (9) | (27) |
Operating income (loss) | (740) | (526) |
Depreciation and amortization expense | 694 | 676 |
Capital expenditures | 268 | 460 |
Total assets | 72,148 | 80,612 |
Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 98,356 | 84,289 |
Cost of services | 79,817 | 68,722 |
Gross profit | 18,539 | 15,567 |
Selling, general and administrative expenses | 9,341 | 8,569 |
Loss (gain) on sale of assets | 0 | (9) |
Operating income (loss) | 9,198 | 7,007 |
Depreciation and amortization expense | 347 | 337 |
Capital expenditures | 132 | 282 |
Total assets | 137,457 | 113,574 |
Infrastructure Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 34,401 | 31,283 |
Cost of services | 23,464 | 23,513 |
Gross profit | 10,937 | 7,770 |
Selling, general and administrative expenses | 5,611 | 4,493 |
Loss (gain) on sale of assets | (1) | 0 |
Operating income (loss) | 5,327 | 3,277 |
Depreciation and amortization expense | 1,441 | 1,120 |
Capital expenditures | 345 | 437 |
Total assets | 129,283 | 112,413 |
Residential [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 119,491 | 92,728 |
Cost of services | 95,963 | 72,585 |
Gross profit | 23,528 | 20,143 |
Selling, general and administrative expenses | 17,327 | 13,720 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | 6,201 | 6,423 |
Depreciation and amortization expense | 1,504 | 210 |
Capital expenditures | 437 | 212 |
Total assets | 198,227 | 77,109 |
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 | 4,083 | 3,802 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | (4,083) | (3,802) |
Depreciation and amortization expense | 34 | 19 |
Capital expenditures | 0 | 0 |
Total assets | $ 72,255 | $ 86,157 |

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