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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Income Statement [Abstract]      
Net sales [1] $ 3,087,004 $ 3,018,665 $ 2,820,270
Cost of goods sold 1,303,840 1,339,095 1,281,566
Gross profit 1,783,164 1,679,570 1,538,704
Advertising expense 164,693 177,143 167,166
Selling, general and administrative expenses 437,977 410,558 394,914
Research and development expense 511,634 467,960 427,043
Total operating expense 1,114,304 1,055,661 989,123
Operating income 668,860 623,909 549,581
Other income (expense):      
Interest income 36,925 33,406 29,653
Foreign currency losses (22,579) (31,651) (23,465)
Other (912) 4,006 11,418
Total other income (expense) 13,434 5,761 17,606
Income before income taxes 682,294 629,670 567,187
Income tax provision (benefit): (Note 6)      
Current 79,234 117,842 114,222
Deferred (91,895) 1,014 (3,262)
Income tax provision (12,661) 118,856 110,960
Net income $ 694,955 $ 510,814 $ 456,227
Basic net income per share (Note 10) (in dollars per share) $ 3.70 $ 2.71 $ 2.39
Diluted net income per share (Note 10) (in dollars per share) $ 3.68 $ 2.70 $ 2.39
[1] The U.S. is the only country which constitutes greater than 10% of net sales to external customers.