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Shareholders' Equity (AOCI and Reclassification) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2023
Dec. 30, 2022
Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 1,859,652 $ 1,709,343 $ 1,283,904
Ending balance 2,224,225 1,859,652 1,709,343
Pension and Postretirement Medical      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (39,734) (60,107) (114,129)
Other comprehensive income (loss) before reclassifications (28,162) 16,083 34,953
Amounts reclassified from accumulated other comprehensive income 36,884 4,290 19,069
Ending balance (31,012) (39,734) (60,107)
Cumulative Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (29,644) (20,062) (10,036)
Other comprehensive income (loss) before reclassifications 25,661 (9,582) (10,026)
Amounts reclassified from accumulated other comprehensive income 0 0 0
Ending balance (3,983) (29,644) (20,062)
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (69,378) (80,169) (124,165)
Other comprehensive income (loss) before reclassifications (2,501) 6,501 24,927
Amounts reclassified from accumulated other comprehensive income 36,884 4,290 19,069
Ending balance $ (34,995) $ (69,378) $ (80,169)