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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2021
Oct. 02, 2020
Jul. 03, 2020
Apr. 03, 2020
Jan. 03, 2020
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 270,052 $ 231,092 $ 259,479 $ 226,915 $ 240,310 $ 271,703 $ 240,275 $ 215,487 $ 987,538 $ 967,775 $ 853,826
Gross profit 191,316 159,862 169,509 184,591 184,406 184,231 186,136 172,080      
Income (loss) from operations 24,297 (42,580) 75,534 52,809 77,316 115,606 91,989 84,559 110,060 369,470 438,855
Net income (loss) $ 28,388 $ (32,040) $ 66,821 $ 48,612 $ 68,743 $ 97,452 $ 79,042 $ 75,775 $ 111,781 $ 321,012 $ 690,070
Net income (loss) per share:                      
Basic (in dollars per share) $ 0.09 $ (0.10) $ 0.22 $ 0.16 $ 0.23 $ 0.32 $ 0.26 $ 0.25 $ 0.36 $ 1.06 $ 2.32
Diluted (in dollars per share) $ 0.09 $ (0.10) $ 0.21 $ 0.15 $ 0.22 $ 0.31 $ 0.25 $ 0.24 $ 0.35 $ 1.02 $ 2.21
Milestone payments earned $ 29,400 $ 13,500 $ 43,500 $ 100 $ 15,100 $ 50,600 $ 20,400 $ 10,000