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Collaboration Agreements (StemSynergy Collaboration, Narrative) (Details) - Collaborative Arrangement With StemSynergy - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Jan. 31, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront and milestone payments		$ 3.0
Additional upfront and milestone payments	$ 1.9	$ 1.2
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement			$ 0.5
First Product To Reach Market
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	$ 56.5