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Pension and Other Postretirement Benefit Plans - Schedule of Change in Combined Fair Value of Plans' Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
U.S. Plans    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at the beginning of the year $ 390,829 $ 147,788
Actual return on plan assets 31,140 9,891
Employer contributions 10,668 58,097
Participants’ contributions 243 839
Gross benefits paid (30,648) (27,914)
Curtailments/settlements/plan amendments (9,751) (9,434)
Acquisition of CH2M Plans 0 211,562
Defined Benefit Plan, Plan Assets, Divestiture 0 0
Effect of exchange rate changes and other, net (2,271) 0
Fair value of plan assets at the end of the year 390,210 390,829
Non-U.S. Plans    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets at the beginning of the year 1,867,481 1,076,928
Actual return on plan assets 280,785 (19,883)
Employer contributions 32,063 31,556
Participants’ contributions 367 451
Gross benefits paid (72,453) (75,711)
Curtailments/settlements/plan amendments (5,814) (5,496)
Acquisition of CH2M Plans 0 869,414
Defined Benefit Plan, Plan Assets, Divestiture (76,111) 0
Effect of exchange rate changes and other, net (109,681) (9,778)
Fair value of plan assets at the end of the year $ 1,916,637 $ 1,867,481