XML 44 R30.htm IDEA: XBRL DOCUMENT
v3.20.2

Business and Summary of Significant Accounting Policies (Details) $ in Millions | 6 Months Ended
--- | ---
Sep. 26, 2020 USD ($)
Accounting Policies [Abstract] |
Amount of lease payments deferred due to COVID-19 | $ 3.7
Amount of lease payments deferred with a signed agreement due to COVID-19 | $ 3.6

X
- 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