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Revenue Recognition - Schedule of Sales Return Liability (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jul. 02, 2022 | Jul. 03, 2021
Sales Return Liability [Roll Forward] |  |
Balance at beginning of year | $ 22,368 | $ 24,765
Additions that reduce net sales | 53,964 | 42,272
Deductions from reserves | (51,676) | (45,820)
Balance at end of period | $ 24,656 | $ 21,217

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- Definition Contract with customer refund liability additions. + References No definition available. + Details
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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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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_
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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 https://asc.fasb.org/extlink&oid=126920602&loc=SL49130611-203046-203046 + Details
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