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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Disaggregation Of Revenue [Line Items] |  |
Revenue recognized, included in beginning deferred contract liability balance | $ 30 |
Transferred at Point in Time |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from goods and services transferred to customers at a point in time | 98.00% | 98.00%

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- Definition revenue from contract with customer, excluding assessed tax, percent + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |