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Acquisitions - Net Assets Acquired (Details) (USD $)
Jul. 27, 2013
Dec. 03, 2012
Jul. 28, 2012
Jul. 30, 2011
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Cash and equivalents   $ 200,000    
Accounts receivable, net   112,200,000    
Costs and estimated earnings in excess of billings   61,500,000    
Inventories   9,000,000    
Other current assets   1,600,000    
Property and equipment   33,300,000    
Goodwill 267,810,000 87,900,000 174,849,000 174,849,000
Other assets   2,300,000    
Total assets   398,600,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Accounts payable   42,100,000    
Billings in excess of costs and estimated earnings   10,300,000    
Accrued and other liabilities   27,100,000    
Total liabilities   79,500,000    
Net Assets Acquired   319,100,000    
Customer Relationships
       
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Intangibles 75,400,000      
Backlog
       
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Intangibles 15,300,000      
Trade Names
       
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Intangibles 5,300,000      
Quanta Services, Inc. | Customer Relationships
       
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Intangibles 70,300,000      
Quanta Services, Inc. | Trade Names
       
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]        
Intangibles $ 5,000,000