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Acquisitions Acquisitions (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended
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