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Revenue Recognition - Schedule of Sales Return Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 01, 2022 | Jan. 02, 2021
Sales Return Liability [Roll Forward] |  |
Balance at beginning of year | $ 24,765 | $ 19,809
Additions that reduce net sales | 91,975 | 81,513
Deduction from reserves | (94,372) | (76,557)
Balance at end of period | $ 22,368 | $ 24,765

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- Definition Contract with customer refund liability additions. + References No definition available. + Details
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Namespace Prefix: | snbr_
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Balance Type: | credit
Period Type: | duration

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- Definition Contract with customer refund liability deductions. + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | snbr_
Data Type: | xbrli:stringItemType
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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123410239&loc=SL49130611-203046-203046 + Details
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