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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Loss (gain) on pension plan changes $ 5,414 $ (9,955) $ 0
Total Other Non-current Assets      
Defined Benefit Plan Disclosure [Line Items]      
Restricted investments   7,700  
Employee loans receivable   2,200  
SG&A Expense      
Defined Benefit Plan Disclosure [Line Items]      
One-time, non-cash benefit   9,900  
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Curtailments/settlements/plan amendments $ (9,434) 0  
Period of annual average returns used in return on plan assets simulation model (in years) 20 years    
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Curtailments/settlements/plan amendments $ (5,496) $ (228)  
Non-U.S. Plans | Sverdrup and Ireland      
Defined Benefit Plan Disclosure [Line Items]      
Loss (gain) on pension plan changes $ 5,400