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Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 02, 2021
Mar. 27, 2020
Apr. 02, 2021
Mar. 27, 2020
Restructuring Cost and Reserve [Line Items]        
Impairment of equity method investment     $ 33,197 $ 0
AWE Management Ltd        
Restructuring Cost and Reserve [Line Items]        
Impairment of equity method investment     33,200  
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 30,347 $ 40,586 78,741 92,627
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Lease Abandonments and Impairments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 2,062 4,782 2,211 4,782
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Voluntary and Involuntary Terminations        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 3,032 4,925 12,536 18,078
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Outside Services        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 18,314 23,405 25,713 54,871
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 6,939 $ 7,474 $ 38,281 $ 14,896