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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
Dec. 31, 2021
Jan. 01, 2021
Restructuring Cost and Reserve [Line Items]    
Impairment of equity method investment $ 72,266 $ 27,902
AWE Management Ltd    
Restructuring Cost and Reserve [Line Items]    
Impairment of equity method investment   27,900
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 69,359 48,393
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Lease Abandonments and Impairments    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 65,542 148
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Voluntary and Involuntary Terminations    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 563 9,503
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Outside Services    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 4,676 7,399
CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale | Other    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ (1,422) $ 31,343