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Defined Pension Benefit Obligations - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 15, 2017
Dec. 31, 2017
USD ($)
Mar. 30, 2018
USD ($)
Plan
Mar. 31, 2017
USD ($)
Mar. 30, 2018
USD ($)
Plan
Mar. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Settlement loss     $ 0 $ (41) $ (3,819) $ (84)
CH2M HILL Companies, Ltd.            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit pension plan assets     1,100,000   1,100,000  
Defined benefit pension plan liabilities     $ 1,200,000   $ 1,200,000  
Business acquisition effective date of acquisition Dec. 15, 2017          
U.S. | Sverdrup Pension Plan            
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   3