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Revenue (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Material contract assets	$ 0
Deferred contract costs	0
Contract liabilities	$ 21,800,000	$ 0
Online Dashboard, Mobile Applications, and Upgrade Rights
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Estimated usage period	2 years
Wearable Technology
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	$ 6,200,000	4,600,000
Gift Cards
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	$ 3,800,000	$ 7,200,000

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