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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
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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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