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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2022
Oct. 03, 2021
Oct. 02, 2022
Oct. 03, 2021
Income Statement [Abstract]        
Revenue $ 209,622 $ 284,848 $ 766,657 $ 793,033
Cost of revenue 57,383 85,712 214,316 208,189
Gross margin 152,239 199,136 552,341 584,844
Research, development, and engineering expenses 33,954 34,476 103,999 99,883
Selling, general, and administrative expenses 75,371 77,113 236,156 226,380
Loss from fire (Note 17) 2,891 0 20,294 0
Operating income 40,023 87,547 191,892 258,581
Foreign currency gain (loss) (1,880) (586) (4,367) (2,233)
Investment income 1,416 1,748 4,389 5,025
Other income (expense) (214) (125) (450) (420)
Income before income tax expense 39,345 88,584 191,464 260,953
Income tax expense 5,365 9,684 31,250 34,607
Net income $ 33,980 $ 78,900 $ 160,214 $ 226,346
Net income per weighted-average common and common-equivalent share:        
Basic (usd per share) $ 0.20 $ 0.45 $ 0.92 $ 1.28
Diluted (usd per share) $ 0.19 $ 0.44 $ 0.91 $ 1.26
Weighted-average common and common-equivalent shares outstanding:        
Basic (shares) 173,256 176,812 173,640 176,572
Diluted (shares) 174,327 180,342 175,233 180,109
Cash dividends per common share (usd per share) $ 0.065 $ 0.060 $ 0.195 $ 0.180