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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Income Statement [Abstract]    
Net sales $ 1,072,327 $ 856,108
Cost of goods sold 430,771 349,168
Gross profit 641,556 506,940
Advertising expense 31,061 26,880
Selling, general and administrative expenses 157,622 137,186
Research and development expense 203,214 165,392
Total operating expense 391,897 329,458
Operating income 249,659 177,482
Other income (expense):    
Interest income 7,652 12,026
Foreign currency losses (8,281) (15,423)
Other income 1,484 3,550
Total other income (expense) 855 153
Income before income taxes 250,514 177,635
Income tax provision 30,485 16,455
Net income $ 220,029 $ 161,180
Net income per share:    
Basic $ 1.15 $ 0.84
Diluted $ 1.14 $ 0.84
Weighted average common shares outstanding:    
Basic 191,896 190,803
Diluted 192,810 191,684