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Repurchases of Common Stock (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	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

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.

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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

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant