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Leases - Schedule of Maturities of Operating Lease Liabilities and Aggregate Future Commitments Under Operating Leases (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Leases [Abstract]
Lessee operating lease, lease not yet commenced, minimum lease payments excluded	$ 51,000
Operating Lease, Liability Current	$ 57,912	$ 0
Lessee operating lease, lease not yet commenced, minimum lease payments included		$ 62,000

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

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
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