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v3.21.1

COVID-19 Pandemic (Details) | 3 Months Ended
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Jun. 27, 2020
Average |
Unusual or Infrequent Item, or Both [Line Items] |
Percentage of stores that are closed | 47.00%

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- Definition Percentage Of Stores That Are Closed, COVID-19 + References No definition available. + Details
Name: | snbr_PercentageOfStoresThatAreClosedCOVID19
Namespace Prefix: | snbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnusualOrInfrequentItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |