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Other Financial Information Other Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 5,815,712    
Other comprehensive income (loss) 138,615 $ (16,245) $ (110,109)
Ending balance 5,940,041 5,815,712  
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (933,057) (916,812)  
Other comprehensive income (loss) 121,420 (19,233)  
Reclassifications from other comprehensive income (loss) (17,195) (2,988)  
Ending balance (794,442) (933,057) (916,812)
Change in Pension and Retiree Medical Plan Liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (498,726) (436,749)  
Other comprehensive income (loss) 94,606 (61,994)  
Reclassifications from other comprehensive income (loss) 9,559 17  
Ending balance (394,561) (498,726) (436,749)
Foreign Currency Translation Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (419,715) (480,045)  
Other comprehensive income (loss) 12,475 60,330  
Reclassifications from other comprehensive income (loss) 0 0  
Ending balance (407,240) (419,715) (480,045)
Gain/(Loss) on Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (14,616) (18)  
Other comprehensive income (loss) 14,339 (17,569)  
Reclassifications from other comprehensive income (loss) 7,636 2,971  
Ending balance $ 7,359 $ (14,616) $ (18)