XML 56 R42.htm IDEA: XBRL DOCUMENT
v3.20.2

Repurchases of Common Stock - Additional Information (Details) $ in Millions | Sep. 26, 2020 USD ($)
--- | ---
Repurchases Of Common Stock [Abstract] |
Remaining authorized stock purchase plan | $ 437

X
- 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

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