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Collaboration Agreements (StemSynergy Collaboration, Narrative) (Details) - Collaborative Arrangement With StemSynergy - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Jan. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront and milestone payments	$ 3.0
Additional upfront and milestone payments	1.2
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement		$ 2.3
First Product To Reach Market
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	$ 56.5