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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 30, 2016
Jul. 25, 2015
Jul. 26, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill $ 310,157 $ 271,653 $ 269,088
Amortization expense for finite-lived intangible assets $ 19,400 16,700 $ 18,300
Fair Value Assumptions, Expected Term 7 years    
Change in fair value, percentage 25.00%    
Customer relationships      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount $ 289,955 195,375  
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 685 $ 635  
TelCom Construction, Inc. | Customer relationships      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount 94,600    
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    
Maximum | Goodwill and Other Indefinite-Lived Intangible Assets      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Fair Value Inputs, Long-term Revenue Growth Rate 3.00% 2.50% 3.00%
Percentage change in fair value input 1.00%    
Minimum | Goodwill and Other Indefinite-Lived Intangible Assets      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Fair Value Inputs, Long-term Revenue Growth Rate 2.00% 1.50% 1.50%
Fair Value Inputs, Discount Rate 11.50% 11.50% 11.50%