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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