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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Intangible Assets Gross Excluding Goodwill $ 202,179 $ 193,082
Accumulated amortization 86,063 67,807
Net Intangible Assets 116,116 125,275
Customer Relationships
    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, weighted average remaining useful lives 11 years 8 months  
Carrying amount 173,594 164,497
Accumulated amortization 69,048 56,219
Backlog
    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, weighted average remaining useful lives 1 year 9 months  
Carrying amount 15,285 15,285
Accumulated amortization 13,490 9,433
Trade Names
    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, weighted average remaining useful lives 4 years 2 months  
Carrying amount 8,200 8,200
Accumulated amortization 3,361 2,071
Noncompete Agreements
    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, weighted average remaining useful lives 3 years 6 months  
Carrying amount 400 400
Accumulated amortization 164 84
UtiliQuest
    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 4,700 $ 4,700