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Revenue Recognition - Schedule of Sales Return Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Sales Return Liability [Roll Forward]
Balance at beginning of year	$ 19,270	$ 15,222
Additions that reduce net sales	79,326	77,226
Deduction from reserves	(78,689)	(73,178)
Balance at end of period	$ 19,907	$ 19,270

X

- Definition

Contract with customer refund liability additions.

+ References

No definition available.

+ Details

Name:	snbr_ContractWithCustomerRefundLiabilityAdditions
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with customer refund liability deductions.

+ References

No definition available.

+ Details

Name:	snbr_ContractWithCustomerRefundLiabilityDeductions
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

Name:	snbr_SalesReturnLiabilityRollForward
Namespace Prefix:	snbr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=108792157&loc=SL49130611-203046-203046

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant