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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Income Statement [Abstract]      
Net sales [1] $ 4,186,573 $ 3,757,505 $ 3,347,444
Cost of goods sold 1,705,237 1,523,529 1,367,725
Gross profit 2,481,336 2,233,976 1,979,719
Advertising expense 151,166 164,456 155,394
Selling, general and administrative expenses 570,245 518,568 478,177
Research and development expense 705,685 605,366 567,805
Total operating expense 1,427,096 1,288,390 1,201,376
Operating income 1,054,240 945,586 778,343
Other income (expense):      
Interest income 37,002 52,817 47,147
Foreign currency gains (losses) 2,825 (16,799) (7,616)
Other income 9,343 5,618 5,373
Total other income (expense) 49,170 41,636 44,904
Income before income taxes 1,103,410 987,222 823,247
Income tax provision (benefit): (Note 6)      
Current 104,471 123,073 93,424
Deferred 6,615 (88,337) 35,743
Income tax provision (benefit) 111,086 34,736 129,167
Net income $ 992,324 $ 952,486 $ 694,080
Basic net income per share (Note 10) $ 5.19 $ 5.01 $ 3.68
Diluted net income per share (Note 10) $ 5.17 $ 4.99 $ 3.66
[1] The U.S. is the only country which constitutes greater than 10% of net sales to external customers