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Shareholders' Deficit - Repurchase of Common Stock - Additional Information (Details) $ in Millions	Dec. 28, 2019 USD ($)
Shareholders Equity [Abstract]
Remaining authorized stock purchase plan	$ 475

X

- Definition

Shareholders' Equity [Abstract]

+ References

No definition available.

+ Details

Name:	snbr_ShareholdersEquityAbstract
Namespace Prefix:	snbr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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