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Revenue Recognition - Schedule of Sales Return Liability (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2023 | Oct. 01, 2022
Sales Return Liability [Roll Forward] |  |
Balance at beginning of year | $ 25,594 | $ 22,368
Additions that reduce net sales | 82,718 | 79,353
Deductions from reserves | (85,300) | (76,070)
Balance at end of period | $ 23,012 | $ 25,651

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

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- Definition Contract with customer refund liability deductions. + References No definition available. + Details
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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-27 + Details
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