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Repurchases of Common Stock (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 30, 2024 | Apr. 01, 2023
Repurchases Of Common Stock [Abstract] |  |
Stock acquired through tax withholding restricted stock | $ 1,000 | $ 3,000
Authorized share repurchase program | 600,000 |
Remaining authorized stock purchase plan | $ 348,000 |

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- Definition Repurchases of Common Stock [Abstract] + References No definition available. + Details
Name: | snbr_RepurchasesOfCommonStockAbstract
Namespace Prefix: | snbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the amount of total investment in stock repurchased for tax withholding on restricted stock. + References No definition available. + Details
Name: | snbr_StockRepurchaseAcquiredThroughTaxWithholdingRestrictedStock
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant