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Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 30, 2016 | Sep. 30, 2016 | Dec. 29, 2017
Deferred Revenue Arrangement [Line Items] |  |  |
Accrued clinical trial liabilities | $ 14,131 | $ 18,700 | $ 19,849
Collaborative Arrangement with Genentech [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Recovery of net losses | $ 23,100 |  |
Recovery of net losses, recognized in current fiscal year |  | $ 9,800 |

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