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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
Dec. 27, 2024
Dec. 29, 2023
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 14,740 $ 38,354
Lease Abandonments and Impairments    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 0 49
Terminations    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 385 11,142
Outside Services    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs 11,412 23,793
Other    
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 2,943 $ 3,370