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Revenues Revenues (Contract Assets and Liabilities) (Details) - USD ($)	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contract assets	$ 1,100,000	$ 0
Contract liabilities	6,596,000	15,897,000
Amount of revenues recognized included in the beginning contract liability balance	6,500,000	8,700,000
Revenues recognized for performance obligations satisfied in previous periods	161,200,000	$ 198,100,000
Transaction price allocated to our performance obligations	63,100,000
Collaborative arrangement with Takeda
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	10,000,000.0
Transaction price allocated to our performance obligations	$ 18,100,000

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- Definition

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

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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