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Collaboration Agreements (Genentech Collaboration, Narrative) (Details) - Genentech [Member] - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 29, 2017	Dec. 30, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of share of the Company in promotions	25.00%
Recovery (loss) of expenses, expenses prior to current fiscal year			$ 8.8
Selling, general and administrative expense [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Recovery (loss) of expenses, expenses prior to current fiscal year			13.3
Contract revenue [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Recovery (loss) of expenses, expenses prior to current fiscal year			$ (4.5)
Profit Sharing Tier One [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of profits		50.00%
Profit Sharing Tier Three [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of profits		30.00%
Minimum [Member] | Profit Sharing Tier Two [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Profit threshold		$ 200.0
Maximum [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of share of the Company in promotions		25.00%
Maximum [Member] | Profit Sharing Tier Three [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Profit threshold		$ 400.0

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