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Repurchases of Common Stock - Additional Information (Details) $ in Millions | Oct. 02, 2021 USD ($)
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Repurchases Of Common Stock [Abstract] |
Authorized share repurchase program | $ 600
Remaining authorized stock purchase plan | $ 403

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- Definition Repurchases of Common Stock [Abstract] + 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 stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant