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Restructuring and Other Charges - Schedule of Restructuring and Other Activities by Major Type of Costs (Details) - CH2M Hill, KeyM, John Wood Group Acquisitions and ECR Sale - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 28, 2024
Jun. 30, 2023
Jun. 28, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 58,088 $ 30,912 $ 141,385 $ 78,196
Lease Abandonments and Impairments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 0 803 49 38,076
Terminations        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 25,494 17,925 49,045 26,434
Outside Services        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 26,793 12,168 73,859 13,646
Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 5,801 $ 16 $ 18,432 $ 40