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Profit Sharing and 401(k) Plan - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Profit Sharing And401 K Plan [Abstract] |  |  |
Employee compensation deferral (in hundredths) | 50.00% |  |
Employer Contributions | $ 6 | $ 5 | $ 5

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

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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