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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 205,647 | $ 179,599 | $ 159,981 | $ 150,766 | $ 159,687 | $ 144,082 | $ 133,752 | $ 136,336 | $ 695,993 | $ 573,857 | $ 512,395
Cost of Services |  |  |  |  |  |  |  |  | 569,013 | 473,966 | 429,269
Gross Profit | 37,538 | $ 33,997 | $ 27,812 | $ 27,633 | 30,427 | $ 25,052 | $ 21,708 | $ 22,704 | 126,980 | 99,891 | 83,126
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 100,558 | 81,416 | 75,571
Contingent Consideration Expense |  |  |  |  |  |  |  |  | 652 | 0 | 0
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 810 | (13) | (86)
Operating Income (Loss) |  |  |  |  |  |  |  |  | 24,960 | 18,488 | 7,641
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,664 | 2,509 | 2,526
Capital Expenditures |  |  |  |  |  |  |  |  | 3,417 | 2,779 | 1,982
Assets | 394,340 |  |  |  | 225,679 |  |  |  | 394,340 | 225,679 | 199,950
Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 189,635 | 141,858 | 116,073
Cost of Services |  |  |  |  |  |  |  |  | 157,104 | 116,015 | 94,904
Gross Profit |  |  |  |  |  |  |  |  | 32,531 | 25,843 | 21,169
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 20,839 | 15,735 | 13,481
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 0 | (18) | 6
Operating Income (Loss) |  |  |  |  |  |  |  |  | 11,692 | 10,126 | 7,682
Depreciation and amortization |  |  |  |  |  |  |  |  | 577 | 512 | 414
Capital Expenditures |  |  |  |  |  |  |  |  | 1,102 | 675 | 331
Assets | 68,018 |  |  |  | 49,500 |  |  |  | 68,018 | 49,500 | 30,415
Residential |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 225,889 | 206,307 | 182,514
Cost of Services |  |  |  |  |  |  |  |  | 171,874 | 164,435 | 148,685
Gross Profit |  |  |  |  |  |  |  |  | 54,015 | 41,872 | 33,829
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 37,585 | 31,877 | 27,947
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 1 | 4 | 4
Operating Income (Loss) |  |  |  |  |  |  |  |  | 16,429 | 9,991 | 5,878
Depreciation and amortization |  |  |  |  |  |  |  |  | 509 | 485 | 491
Capital Expenditures |  |  |  |  |  |  |  |  | 704 | 352 | 420
Assets | 43,195 |  |  |  | 37,755 |  |  |  | 43,195 | 37,755 | 40,555
Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 222,466 | 178,865 | 166,249
Cost of Services |  |  |  |  |  |  |  |  | 197,679 | 157,322 | 148,081
Gross Profit |  |  |  |  |  |  |  |  | 24,787 | 21,543 | 18,168
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 17,169 | 15,027 | 14,479
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | (17) | (11) | (46)
Operating Income (Loss) |  |  |  |  |  |  |  |  | 7,635 | 6,527 | 3,735
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,234 | 283 | 270
Capital Expenditures |  |  |  |  |  |  |  |  | 795 | 391 | 266
Assets | 59,763 |  |  |  | 44,156 |  |  |  | 59,763 | 44,156 | 43,937
MISCOR [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 58,003 | 46,827 | 47,559
Cost of Services |  |  |  |  |  |  |  |  | 42,356 | 36,194 | 37,599
Gross Profit |  |  |  |  |  |  |  |  | 15,647 | 10,633 | 9,960
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 12,404 | 9,498 | 9,346
Contingent Consideration Expense |  |  |  |  |  |  |  |  | 652 |  |
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 826 | 12 | (50)
Operating Income (Loss) |  |  |  |  |  |  |  |  | 1,765 | 1,123 | 664
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,072 | 952 | 980
Capital Expenditures |  |  |  |  |  |  |  |  | 721 | 1,197 | 828
Assets | 89,447 |  |  |  | 30,112 |  |  |  | 89,447 | 30,112 | 27,272
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of Services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross Profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 12,561 | 9,279 | 10,318
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  | (12,561) | (9,279) | (10,318)
Depreciation and amortization |  |  |  |  |  |  |  |  | 272 | 277 | 371
Capital Expenditures |  |  |  |  |  |  |  |  | 95 | 164 | 137
Assets | $ 133,917 |  |  |  | $ 64,156 |  |  |  | $ 133,917 | $ 64,156 | $ 57,771

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