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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 25, 2015
Jul. 26, 2014
Jul. 27, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill $ 271,653 $ 269,088 $ 267,810
Excess carrying value, percent 25.00%    
Amortization expense for finite-lived intangible assets $ 16,700 18,300 20,700
Customer relationships      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount 195,375 173,594  
Customer relationships | Hewitt Power & Communications, Inc      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount 21,800   $ 200
Contract backlog      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount 8,076 $ 15,285  
Contract backlog | Hewitt Power & Communications, Inc      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Carrying amount $ 7,200