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Acquisitions (Details) (USD $)	12 Months Ended				12 Months Ended			3 Months Ended			12 Months Ended		0 Months Ended				0 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011	Jul. 26, 2014	Jul. 26, 2014 Acquired Subsidiaries	Jul. 27, 2013 Acquired Subsidiaries	Dec. 03, 2012 Acquired Subsidiaries	Jul. 27, 2013 Sage	Apr. 26, 2014 Telecommunications Specialty Construction Contractor, Canada	Jul. 26, 2014 Watts Brothers	Jul. 26, 2014 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	Jul. 26, 2014 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021	Jul. 27, 2013 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021	Jul. 28, 2012 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													90,000,000.0				90,000,000
Debt, interest rate (in percent)														7.125%	7.125%	7.125%
Repayments of credit facility											90,000,000
Goodwill	267,810,000	174,849,000		269,088,000			87,900,000
Carrying amount							90,600,000
Revenues					472,200,000	335,400,000
Amortization expense for finite-lived intangible assets	18,300,000	20,700,000	6,500,000		11,500,000	14,300,000
Operating Income (Loss)					6,900,000
Acquisition payments								11,300,000	700,000	16,400,000
Additional future acquisition payment amount										$ 500,000

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