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Business Combinations (Details) - USD ($)
$ in Billions
9 Months Ended
Dec. 13, 2013
Jun. 26, 2015
Sep. 26, 2014
Sinclair Knight Merz      
Business Acquisition [Line Items]      
Payments to acquire business $ 1.2    
Zamel and Turbag Consulting Engineers Company (ZATE)      
Business Acquisition [Line Items]      
Total ownership (percent)     15.00%
Additional interest acquired (percent)     75.00%
Minimum | Sinclair Knight Merz      
Business Acquisition [Line Items]      
Useful life of intangibles (duration)   3 years  
Maximum | Sinclair Knight Merz      
Business Acquisition [Line Items]      
Useful life of intangibles (duration)   12 years