XML 91 R68.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

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