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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
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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

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- Definition Lessee operating lease lease not yet commenced minimum lease payments excluded. + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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