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Pension and Other Postretirement Benefit Plans - Accumulated Benefit Obligation (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Sep. 29, 2017
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation at the end of the year $ 447,549 $ 169,942
Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation at the end of the year $ 2,123,839 $ 1,291,600