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Acquisitions Acquisitions (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended
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Jan. 26, 2013 | Jan. 26, 2013 | Jan. 28, 2012 | Dec. 03, 2012 | Dec. 03, 2012 Quanta Services, Inc. | Dec. 03, 2012 Senior Loan and Revolving Credit Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 12, 2012 Senior Subordinated Notes Seven Point One Two Five Percent Senior Subordinated Notes Due 2021 | Jan. 26, 2013 Senior Subordinated Notes Seven Point One Two Five Percent Senior Subordinated Notes Due 2021 | Jul. 28, 2012 Senior Subordinated Notes Seven Point One Two Five Percent Senior Subordinated Notes Due 2021 | Dec. 12, 2012 Senior Subordinated Notes Seven Point One Two Five Percent Senior Subordinated Notes Due 2021 Dycom Investments, Inc.
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid to acquire Quanta Services |  |  |  |  | $ 275,000,000 |  |  |  |  |
Estimated adjustment for working capital received in excess of target amount |  |  |  |  | 41,000,000 |  |  |  |  |
Amount paid for other specified items |  |  |  |  | 0 |  |  |  |  |
Cash paid for acquisitions |  | (314,771,000) | 0 |  |  |  |  |  |  |
Accrued remaining purchase price of acquisition | 4,710,000 | 4,710,000 |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  | 400,000,000 |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  | 90,000,000 |  |  | 90,000,000
Debt, interest rate (in percent) |  |  |  |  |  |  |  | 7.125% | 7.125% |
Acquisition related costs | 5,800,000 | 6,500,000 |  |  |  |  |  |  |  |
Integration related costs | 900,000 |  |  |  |  |  |  |  |  |
Revenues generated by acquired subsidiaries |  | $ 75,900,000 |  |  |  |  |  |  |  |
Number of States in which Entity Operates |  |  |  | 49 |  |  |  |  |  |
Number of Customers Served |  |  |  | 300 |  |  |  |  |  |
Entity Number of Employees |  |  |  | 2,157 |  |  |  |  |  |

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