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Profit Sharing and 401(k) Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2024 | Jul. 01, 2023 | Jun. 29, 2024 | Jul. 01, 2023
Profit Sharing And 401(k) Plan [Abstract] |  |  |  |
Employee compensation deferral (as a percent) |  |  | 50.00% |
Employer contributions | $ 1.2 | $ 2.8 | $ 3.2 | $ 5.2

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- Definition Defined Contribution Plan, Employer Contribution Amount + References No definition available. + Details
Name: | snbr_DefinedContributionPlanEmployerContributionAmount
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Profit sharing and 401 (k) plan. + References No definition available. + Details
Name: | snbr_ProfitSharingAnd401kPlanAbstract
Namespace Prefix: | snbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration