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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Income Statement [Abstract]    
Net sales $ 1,172,662 $ 1,072,327
Cost of goods sold 510,183 430,771
Gross profit 662,479 641,556
Advertising expense 34,133 31,061
Selling, general and administrative expenses 190,784 171,987
Research and development expense 209,006 188,849
Total operating expense 433,923 391,897
Operating income 228,556 249,659
Other income (expense):    
Interest income 7,553 7,652
Foreign currency losses (3,506) (8,281)
Other income 3,261 1,484
Total other income (expense) 7,308 855
Income before income taxes 235,864 250,514
Income tax provision 24,272 30,485
Net income $ 211,592 $ 220,029
Net income per share:    
Basic $ 1.10 $ 1.15
Diluted $ 1.09 $ 1.14
Weighted average common shares outstanding:    
Basic 192,887 191,896
Diluted 193,579 192,810