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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 24, 2015
Oct. 25, 2014
Aug. 07, 2015
Jul. 25, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill $ 281,448     $ 271,653
Amortization expense for finite-lived intangible assets 4,800 $ 4,100    
Customer relationships        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount 211,575     195,375
Trade names        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount 9,800     8,200
Non-compete agreements        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount 835     $ 635
TelCom Construction, Inc.        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill     $ 9,700  
TelCom Construction, Inc. | Customer relationships        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount 16,200      
TelCom Construction, Inc. | Trade names        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount 1,600      
TelCom Construction, Inc. | Non-compete agreements        
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]        
Carrying amount $ 200