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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