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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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