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Leases - Schedule of Maturities of Operating Lease Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 30, 2018	Dec. 29, 2018
Lessee Lease Description [Line Items]
Operating Lease, Liability Current	$ 59,561		$ 0
ASC 842
Lessee Lease Description [Line Items]
Lessee operating lease, lease not yet commenced, minimum lease payments excluded	43,000
Operating Lease, Liability Current	$ 60,000	$ 52,000

X

- Definition

Lessee operating lease lease not yet commenced minimum lease payments excluded.

+ References

No definition available.

+ Details

Name:	snbr_LesseeOperatingLeaseLeaseNotYetCommencedMinimumLeasePaymentsExcluded
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: