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Profit Sharing and 401(k) Plan (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 30, 2024 | Apr. 01, 2023
Profit Sharing And 401(k) Plan [Abstract] |  |
Employee compensation deferral (as a percent) | 50.00% |
Employer contributions | $ 2.0 | $ 2.4

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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

X
- 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