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Acquisitions - Net Assets Acquired (Details) (USD $)
3 Months Ended 9 Months Ended
Apr. 26, 2014
Jul. 27, 2013
Dec. 03, 2012
Jul. 27, 2013
Order or Production Backlog
Apr. 26, 2014
Businesses Acquired in Fiscal 2013
Apr. 27, 2013
Businesses Acquired in Fiscal 2013
Apr. 26, 2014
Businesses Acquired in Fiscal 2013
Apr. 27, 2013
Businesses Acquired in Fiscal 2013
Jul. 27, 2013
Q2 Fiscal 2013 Businesses Acquired
Customer Relationships
Jul. 27, 2013
Q2 Fiscal 2013 Businesses Acquired
Trade Names
Business Acquisition [Line Items]                    
Operating Income (Loss)         $ 100,000 $ 0 $ 4,100,000 $ 0    
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract [Abstract]                    
Cash and equivalents     200,000              
Accounts receivable, net     112,200,000              
Costs and estimated earnings in excess of billings     61,500,000              
Inventories     9,000,000              
Other current assets     1,600,000              
Property and equipment     33,300,000              
Goodwill 267,810,000 267,810,000 87,900,000              
Intangibles       15,300,000         70,300,000 5,000,000
Other assets     2,300,000              
Total assets     398,600,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]                    
Accounts payable     42,100,000              
Billings in excess of costs and estimated earnings     10,300,000              
Accrued and other liabilities     27,100,000              
Total liabilities     79,500,000              
Net Assets Acquired     $ 319,100,000