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Earnings Per Share (Details) - $ / shares
shares in Thousands
3 Months Ended
Apr. 04, 2021
Mar. 29, 2020
Reconciliation of basic net earnings per share to diluted net earnings per share    
Basic net earnings per share $ 2.35 $ 2.20
Average shares outstanding — basic 2,631,600 2,633,700
Potential shares exercisable under stock option plans 128,400 126,000
Less: shares which could be repurchased under treasury stock method (87,300) (89,400)
Convertible debt shares 0 700
Average shares outstanding — diluted 2,672,700 2,671,000
Diluted net earnings per share $ 2.32 $ 2.17
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 9,000 10,000