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Collaboration Agreements (Invenra Collaboration, Narrative) (Details) - Collaborative Arrangement With Invenra - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	May 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront and milestone payments	$ 2.0
Project initiation fee	2.0
Discovery Project
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront and milestone payments	2.0
Development and Regulatory Milestone
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	131.5
Additional Development and Regulatory Milestone
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	$ 127.5
Product Commercialization
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement		$ 325.0

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- Definition

Eligible Payment From Collaboration For Development And Regulatory Milestone Achievement Under Collaborations Agreement

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