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Repurchases of Common Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 27, 2025 | Sep. 28, 2024
Repurchases Of Common Stock [Abstract] |  |  |  |
Stock acquired through tax withholding restricted stock | $ 0.1 | $ 0.1 | $ 1.0 | $ 0.7
Authorized share repurchase program | 600.0 |  | 600.0 |
Remaining authorized stock purchase plan | $ 348.0 |  | $ 348.0 |

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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 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 authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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