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Quarterly Financial Data (Unaudited) (Summary of Unaudited Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 120,072	$ 152,510	$ 99,008	$ 80,887	$ 853,826	$ 452,477	$ 191,454
Gross profit	168,873	155,586	139,839	128,633	91,520	91,758	84,990	65,674
Income from operations	111,602	125,176	85,770	116,307	37,431	81,180	27,113	20,186	438,855	165,910	(28,124)
Net income	$ 360,089	$ 126,630	$ 87,494	$ 115,857	$ 38,489	$ 81,382	$ 17,656	$ 16,700	$ 690,070	$ 154,227	$ (70,222)
Net income per share, basic (in dollars per share)	$ 1.20	$ 0.42	$ 0.29	$ 0.39	$ 0.13	$ 0.28	$ 0.06	$ 0.06	$ 2.32	$ 0.52	$ (0.28)
Net income per share, diluted (in dollars per share)	$ 1.15	$ 0.41	$ 0.28	$ 0.37	$ 0.12	$ 0.26	$ 0.06	$ 0.05	$ 2.21	$ 0.49	$ (0.28)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Selling, general and administrative									$ 206,366	$ 159,362	$ 116,145
Revenues	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 120,072	$ 152,510	$ 99,008	$ 80,887	853,826	452,477	191,454
Restatement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Selling, general and administrative				$ (1,400)
Collaboration revenue
Quarterly Financial Information Disclosure [Abstract]
Total revenues									234,547	103,469	56,079
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenues									$ 234,547	$ 103,469	$ 56,079
Collaboration revenue | Restatement
Quarterly Financial Information Disclosure [Abstract]
Total revenues								1,400
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenues								$ 1,400

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