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v3.20.2

Business and Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended
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Jun. 27, 2020 USD ($)
Accounting Policies [Abstract] |
Amount of lease payments deferred due to COVID-19 | $ 5.0
Amount of lease payments deferred with a signed agreement due to COVID-19 | $ 3.5

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- Definition Lease Payment Deferral, COVID-19 + References No definition available. + Details
Name: | snbr_LeasePaymentDeferralCOVID19
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease Payment Deferral With Signed Agreement, COVID-19 + References No definition available. + Details
Name: | snbr_LeasePaymentDeferralWithSignedAgreementCOVID19
Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration