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Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2025 | Jun. 28, 2025 | Jun. 29, 2024
Accounting Policies [Abstract] |  |  |
Payment to secure contractual rights | $ 3,300 | $ 3,280 | $ 0

X
- Definition Payment To Secure Contractual Rights + References No definition available. + Details
Name: | snbr_PaymentToSecureContractualRights
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration