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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Revenue Recognition [Abstract]
Accrued Liabilities For Commissions Expense And Taxes	$ 100		$ 100
Disaggregation Of Revenue [Line Items]
Revenues	256,914	$ 205,677	500,756	$ 403,977
Unbilled Receivables Current	10,173		10,173
Costs and estimated earnings on uncompleted contracts	586,289		586,289		$ 539,226
Billings to date and unbilled accounts receivable	(590,928)		(590,928)		(541,606)
Contracts in process, net	(4,639)		(4,639)		(2,380)
Costs in Excess of Billings on Uncompleted Contracts or Programs	28,293		28,293		31,446
Billings in excess of costs and estimated earnings	(32,932)		(32,932)		$ (33,826)
Revenue recognized on contract liabilities	18,114	14,977	24,701	25,575
Performance obligations	423,718		423,718
Performance obligation next 12 months	376,680		376,680
Fixed Price Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	227,251	182,141	441,876	364,044
Time And Materials Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	29,663	23,536	58,880	39,933
Commercial & Industrial [Member]
Disaggregation Of Revenue [Line Items]
Revenues	79,975	65,589	152,558	118,591
Commercial & Industrial [Member] | Fixed Price Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	76,467	58,183	142,297	107,103
Commercial & Industrial [Member] | Time And Materials Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,508	7,406	10,261	11,488
Communications [Member]
Disaggregation Of Revenue [Line Items]
Revenues	70,437	50,244	139,762	104,703
Communications [Member] | Fixed Price Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	48,602	37,344	97,431	81,500
Communications [Member] | Time And Materials Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	21,835	12,900	42,331	23,203
Infrastructure Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenues	34,450	23,866	63,929	45,551
Infrastructure Solutions [Member] | Fixed Price Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	30,130	20,636	57,641	40,309
Infrastructure Solutions [Member] | Time And Materials Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,320	3,230	6,288	5,242
Industrial Services Member [Member]
Disaggregation Of Revenue [Line Items]
Revenues	12,145	10,404	24,368	21,457
Custom Power Solutions Member [Member]
Disaggregation Of Revenue [Line Items]
Revenues	22,305	13,462	39,561	24,094
Residential [Member]
Disaggregation Of Revenue [Line Items]
Revenues	72,052	65,978	144,507	135,132
Residential [Member] | Fixed Price Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	72,052	65,978	144,507	135,132
Residential [Member] | Time And Materials Contract [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0	0	0	0
Single-Family Member [Member]
Disaggregation Of Revenue [Line Items]
Revenues	51,492	43,594	101,968	88,208
Multi-Family Member [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 20,560	$ 22,384	$ 42,539	$ 46,924

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