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Business and Summary of Significant Accounting Policies Property and Equipment - Estimated Useful Lives of Property and Equipment (Details) | 12 Months Ended
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Jan. 02, 2021
Leasehold improvements | Minimum |
Property and equipment [Line Items] |
Estimated useful lives | 5 years
Leasehold improvements | Maximum |
Property and equipment [Line Items] |
Estimated useful lives | 15 years
Furniture and equipment | Minimum |
Property and equipment [Line Items] |
Estimated useful lives | 3 years
Furniture and equipment | Maximum |
Property and equipment [Line Items] |
Estimated useful lives | 15 years
Production machinery | Minimum |
Property and equipment [Line Items] |
Estimated useful lives | 3 years
Production machinery | Maximum |
Property and equipment [Line Items] |
Estimated useful lives | 7 years
Computer equipment and software | Minimum |
Property and equipment [Line Items] |
Estimated useful lives | 3 years
Computer equipment and software | Maximum |
Property and equipment [Line Items] |
Estimated useful lives | 12 years

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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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=snbr_ComputerEquipmentAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |