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Revenue (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, performance obligation timing		seven year
Material contract assets	$ 0
Deferred contract costs	0
Contract liabilities	$ 13,400,000	$ 21,800,000
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	$ 5,300,000	6,200,000
Gift Cards
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	$ 3,300,000	$ 3,800,000

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

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