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Leases - Additional Information (Details) | Sep. 30, 2023
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Minimum | Retail Store Leases |
Lessee, Lease, Description [Line Items] |
Lease term | 5 years
Minimum | Lease Vehicles and Certain Equipment Under Operating Leases |
Lessee, Lease, Description [Line Items] |
Lease term | 3 years
Maximum | Retail Store Leases |
Lessee, Lease, Description [Line Items] |
Lease term | 10 years
Maximum | Office and Manufacturing Leases |
Lessee, Lease, Description [Line Items] |
Lease term | 15 years
Maximum | Lease Vehicles and Certain Equipment Under Operating Leases |
Lessee, Lease, Description [Line Items] |
Lease term | 6 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=snbr_RetailStoreLeasesMember
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
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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