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Revenue - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Material contract assets	$ 0
Deferred contract costs	0
Contract liabilities	$ 9,900,000	$ 13,400,000
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	$ 4,600,000	5,300,000
Gift Cards
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	$ 4,200,000	$ 3,300,000

X

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Contract With Customer, Liability, Amortization Period

+ References

No definition available.

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ 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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 8
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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