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Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2023
Mar. 27, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 4,021,968 $ 3,754,748
Other comprehensive income (loss) before reclassifications 23,646 (23,026)
Amounts reclassified from accumulated other comprehensive income (1,455) 1,740
Net current-period other comprehensive income 22,191 (21,286)
Ending balance 4,110,253 3,795,534
Cash Flow Hedges    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 4,931 1,081
Other comprehensive income (loss) before reclassifications 5,260 57
Amounts reclassified from accumulated other comprehensive income (2,852) 400
Net current-period other comprehensive income 2,408 457
Ending balance 7,339 1,538
Pension and Other Postretirement Benefit Plans    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (135,799) (138,290)
Other comprehensive income (loss) before reclassifications (184) 246
Amounts reclassified from accumulated other comprehensive income 1,397 1,340
Net current-period other comprehensive income 1,213 1,586
Ending balance (134,586) (136,704)
Foreign Currency Translation Adjustment    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (272,654) (209,750)
Other comprehensive income (loss) before reclassifications 18,570 (23,329)
Amounts reclassified from accumulated other comprehensive income 0 0
Net current-period other comprehensive income 18,570 (23,329)
Ending balance (254,084) (233,079)
Accumulated Other Comprehensive (Loss) Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (403,522) (346,959)
Ending balance $ (381,331) $ (368,245)