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Acquisitions (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended
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Oct. 26, 2013 | Oct. 27, 2012 | Jul. 27, 2013 | Dec. 03, 2012 | Dec. 03, 2012 Quanta Services, Inc. | Oct. 26, 2013 Sage Telecommunications Corp of Colorado, LLC | Oct. 26, 2013 Businesses Acquired in Fiscal 2013 | Oct. 26, 2013 Senior Loan and Revolving Credit Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 03, 2012 Senior Loan and Revolving Credit Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 12, 2012 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Oct. 26, 2013 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Jul. 27, 2013 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Dec. 12, 2012 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 Dycom Investments, Inc.
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  | $ 275,000,000 |  |  |  |  |  |  |  |
Estimated adjustment for working capital received in excess of target amount |  |  |  |  | 40,400,000 |  |  |  |  |  |  |  |
Amount paid for other specified items |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |
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% |
Repayments of credit facility |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |
Number of states in which entity operates |  |  |  | 50 |  |  |  |  |  |  |  |  |
Acquisition payments |  |  |  |  |  | 11,300,000 |  |  |  |  |  |  |
Goodwill | 267,810,000 |  | 267,810,000 | 87,900,000 |  | 5,000,000 |  |  |  |  |  |  |
Carrying amount |  |  |  | 90,600,000 |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 150,300,000 |  |  |  |  |  |
Amortization expense for finite-lived intangible assets | 5,200,000 | 1,600,000 |  |  |  |  | 3,400,000 |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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