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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 25, 2015
Jul. 26, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Intangible Assets Gross Excluding Goodwill $ 216,986 $ 202,179
Accumulated amortization: 96,060 86,063
Intangible assets, net $ 120,926 116,116
Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful lives (in years) 11 years 7 months  
Carrying amount $ 195,375 173,594
Accumulated amortization: $ 83,772 69,048
Contract backlog    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful lives (in years) 2 years 5 months  
Carrying amount $ 8,076 15,285
Accumulated amortization: $ 7,381 13,490
Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful lives (in years) 3 years 4 months 24 days  
Carrying amount $ 8,200 8,200
Accumulated amortization: $ 4,650 3,361
Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful lives (in years) 2 years 2 months 12 days  
Carrying amount $ 635 400
Accumulated amortization: 257 164
UtiliQuest    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
UtiliQuest trade name $ 4,700 $ 4,700