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Defined Pension Benefit Obligations (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Dec. 15, 2017
Dec. 31, 2017
USD ($)
Dec. 29, 2017
USD ($)
Plan
Dec. 30, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss     $ (3,819) $ (43)
CH2M HILL Companies, Ltd.        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit pension plan assets     1,100,000  
Defined benefit pension plan liabilities     1,200,000  
Business acquisition effective date of acquisition Dec. 15, 2017      
UK Plans        
Defined Benefit Plan Disclosure [Line Items]        
Pension plans estimated funding deficit     201,300  
UK Pension Plans | Jacobs UK Limited        
Defined Benefit Plan Disclosure [Line Items]        
Note payable related to state principal     131,600  
Note payable related to principal and interest     $ 12,500  
Defined benefit plan long term note issued term of years     15 years  
U.S. | Sverdrup Pension Plan | Subsequent Event        
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss   $ 3,800    
U.S. | CH2M HILL Companies, Ltd.        
Defined Benefit Plan Disclosure [Line Items]        
Number of noncontributory defined benefit pension plans | Plan     3