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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |
Cost of services | $ 400,782 | $ 256,159 |
Gross profit | 79,727 | 58,679 |
Selling, general and administrative expenses | 59,402 | 42,786 |
Contingent consideration | 69 | 0 |
Loss (gain) on sale of assets | (5) | (10) |
Operating income (loss) | 20,261 | 15,903 |
Depreciation and amortization expense | 6,214 | 4,020 |
Capital expenditures | 12,339 | 1,182 |
Total assets | 785,228 | 609,370 | $ 766,622
Revenues | 480,509 | 314,838 |
Commercial and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services | 60,378 | 56,915 |
Gross profit | 8,870 | 5,675 |
Selling, general and administrative expenses | 7,268 | 6,424 |
Loss (gain) on sale of assets | (7) | (9) |
Operating income (loss) | 1,609 | (740) |
Depreciation and amortization expense | 630 | 694 |
Capital expenditures | 245 | 268 |
Total assets | 94,157 | 72,148 |
Revenues | 69,248 | 62,590 |
Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services | 106,891 | 79,817 |
Gross profit | 20,498 | 18,539 |
Selling, general and administrative expenses | 11,384 | 9,341 |
Loss (gain) on sale of assets | (6) | 0 |
Operating income (loss) | 9,120 | 9,198 |
Depreciation and amortization expense | 359 | 347 |
Capital expenditures | 594 | 132 |
Total assets | 161,419 | 137,457 |
Revenues | 127,389 | 98,356 |
Infrastructure Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services | 34,375 | 23,464 |
Gross profit | 7,721 | 10,937 |
Selling, general and administrative expenses | 6,059 | 5,611 |
Loss (gain) on sale of assets | 0 | (1) |
Operating income (loss) | 1,662 | 5,327 |
Depreciation and amortization expense | 1,343 | 1,441 |
Capital expenditures | 10,316 | 345 |
Total assets | 145,722 | 129,283 |
Revenues | 42,096 | 34,401 |
Residential [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services | 199,138 | 95,963 |
Gross profit | 42,638 | 23,528 |
Selling, general and administrative expenses | 30,995 | 17,327 |
Contingent consideration | 69 |  |
Loss (gain) on sale of assets | 8 | 0 |
Operating income (loss) | 11,566 | 6,201 |
Depreciation and amortization expense | 3,852 | 1,504 |
Capital expenditures | 1,184 | 437 |
Total assets | 338,824 | 198,227 |
Revenues | 241,776 | 119,491 |
Corporate Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services | 0 | 0 |
Gross profit | 0 | 0 |
Selling, general and administrative expenses | 3,696 | 4,083 |
Loss (gain) on sale of assets | 0 | 0 |
Operating income (loss) | (3,696) | (4,083) |
Depreciation and amortization expense | 30 | 34 |
Capital expenditures | 0 | 0 |
Total assets | 45,106 | 72,255 |
Revenues | $ 0 | $ 0 |

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