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Pension and Other Postretirement Benefit Plans - Schedule of Change in Plans' Combined Net Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net benefit obligation at the beginning of the year $ 448,402 $ 169,942  
Service cost 2,784 4,765 $ 1,000
Interest cost 16,697 13,778 5,757
Participants’ contributions 243 839  
Actuarial (gains)/losses 52,720 (30,730)  
Benefits paid (30,648) (27,914)  
Curtailments/settlements/plan amendments (39,388) (9,434)  
Acquisition of CH2M Plans 0 327,156  
Disposition of ECR Plans 0 0  
Effect of exchange rate changes and other, net (2,270) 0  
Net benefit obligation at the end of the year 448,540 448,402 169,942
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net benefit obligation at the beginning of the year 2,149,246 1,306,807  
Service cost 7,171 8,269 7,509
Interest cost 52,627 49,324 31,205
Participants’ contributions 367 451  
Actuarial (gains)/losses 314,889 (43,595)  
Benefits paid (72,453) (75,711)  
Curtailments/settlements/plan amendments 30,124 (6,136)  
Acquisition of CH2M Plans 0 924,233  
Disposition of ECR Plans (99,504) 0  
Effect of exchange rate changes and other, net (124,338) (14,396)  
Net benefit obligation at the end of the year $ 2,258,129 $ 2,149,246 $ 1,306,807