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Significant Accounting Policies (Business Combination Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 13, 2013
Oct. 02, 2015
Sep. 26, 2014
Sinclair Knight Merz      
Business Acquisition [Line Items]      
Payments to acquire business $ 1,200,000    
Adjustment to pro-forma earnings     $ 335,658
Pro-forma interest expense     2,100
Pro-forma intangible amortization     19,900
Loss from settlement related to shareholding plan provisions     24,000
Sinclair Knight Merz | Acquisition-related Costs      
Business Acquisition [Line Items]      
Adjustment to pro-forma earnings     21,400
Sinclair Knight Merz | Interest Expense      
Business Acquisition [Line Items]      
Adjustment to pro-forma earnings     2,300
Sinclair Knight Merz | Intangible Asset Amortization      
Business Acquisition [Line Items]      
Adjustment to pro-forma earnings     $ (2,500)
Sinclair Knight Merz | Selling, General and Administrative Expenses      
Business Acquisition [Line Items]      
Acquisition-related costs   $ 9,200  
Sinclair Knight Merz | Minimum      
Business Acquisition [Line Items]      
Intangible assets useful life (duration/period)   3 years  
Sinclair Knight Merz | Maximum      
Business Acquisition [Line Items]      
Intangible assets useful life (duration/period)   12 years  
Zamel and Turbag Consulting Engineers Company (ZATE)      
Business Acquisition [Line Items]      
Additional percentage of ZATE equity acquired     15.00%
Total percentage ownership of ZATE     75.00%