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Restructuring and Other Charges (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Restructuring Cost And Reserve [Line Items]      
Restructuring pre-tax net charges     $ 22,600
Net realizable value write-offs on contract accounts receivables     16,500
Statutory redundancy and severance costs     1,400
Other liabilities     $ 4,700
Additional charges recorded under business exit   $ 1,200  
CH2M HILL Companies, Ltd.      
Restructuring Cost And Reserve [Line Items]      
Restructuring pre-tax net charges $ 19,300,000