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Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 15, 2017
Sep. 29, 2017
Assets      
Goodwill $ 6,103,856   $ 3,009,826
CH2M HILL Companies, Ltd.      
Assets      
Cash and cash equivalents   $ 315,200  
Receivables   1,124,600  
Prepaid expenses and other   72,700  
Property, equipment and improvements, net   175,100  
Goodwill   3,129,100  
Identifiable intangible assets:      
Total identifiable intangible assets   416,700  
Miscellaneous   522,900  
Total Assets   5,756,300  
Liabilities      
Notes payable   2,200  
Accounts payable   309,600  
Accrued liabilities   753,100  
Billings in excess of costs   260,800  
Identifiable intangible liabilities:      
Lease intangible liabilities   9,600  
Long-term debt   706,000  
Other deferred liabilities   653,000  
Total Liabilities   2,694,300  
Noncontrolling interests   (37,300)  
Net assets acquired   3,024,700  
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog      
Identifiable intangible assets:      
Total identifiable intangible assets   412,300  
CH2M HILL Companies, Ltd. | Lease intangible assets      
Identifiable intangible assets:      
Total identifiable intangible assets   $ 4,400