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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 29, 2018	Jun. 29, 2018	Mar. 31, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 967,775	$ 853,826	$ 452,477
Gross profit	184,406	184,231	186,136	172,080	168,873	155,586	139,839	128,633
Income from operations	77,316	115,606	91,989	84,559	111,602	125,176	85,770	116,307	369,470	438,855	165,910
Net income	$ 68,743	$ 97,452	$ 79,042	$ 75,775	$ 360,089	$ 126,630	$ 87,494	$ 115,857	$ 321,012	$ 690,070	$ 154,227
Net income per share, basic (in dollars per share)	$ 0.23	$ 0.32	$ 0.26	$ 0.25	$ 1.20	$ 0.42	$ 0.29	$ 0.39	$ 1.06	$ 2.32	$ 0.52
Net income per share, diluted (in dollars per share)	$ 0.22	$ 0.31	$ 0.25	$ 0.24	$ 1.15	$ 0.41	$ 0.28	$ 0.37	$ 1.02	$ 2.21	$ 0.49
Income tax provision (benefit)					$ 244,100				$ 3,500	$ (360,800)
Milestone payments earned	$ 15,100	$ 50,600	$ 20,400	$ 10,000	$ 29,600	$ 42,600	$ 25,800	$ 66,500

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