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Acquisitions - Net Assets Acquired (Details) (USD $)
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Dec. 03, 2012
Acquired Subsidiaries
Dec. 03, 2012
Acquired Subsidiaries
Customer Relationships
Dec. 03, 2012
Acquired Subsidiaries
Backlog
Dec. 03, 2012
Acquired Subsidiaries
Trade Names
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 269,088,000 267,810,000 174,849,000 87,900,000      
Intangibles         70,300,000 15,300,000 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