Name:	snbr_FutureRetailStoreAndOtherLeaseCommitmentsTerm
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Future Retail Store And Other Leases, Total Lease Payments

No definition available.

Name:	snbr_FutureRetailStoreAndOtherLeasesTotalLeasePayments
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The number of lease commitments the company has entered into for future retail store locations.

No definition available.

Name:	snbr_NumberOfFutureRetailStoreAndOtherLeaseCommitments
Namespace Prefix:	snbr_
Data Type:	xbrli:integerItemType
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Number Of Shareholder Litigation Demands

No definition available.

Name:	snbr_NumberOfShareholderLitigationDemands
Namespace Prefix:	snbr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
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Data Type:	xbrli:stringItemType
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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=srt_RetailSiteMember
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Name:	srt_RangeAxis=srt_MinimumMember
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