Document and Entity Information - USD ($)	12 Months Ended
	Dec. 30, 2017	Jan. 26, 2018	Jul. 01, 2017
Entity Information [Line Items]
Registrant Name	SLEEP NUMBER CORP
Central Index Key	0000827187
Current Fiscal Year End Date	--12-30
Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		38,487,000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 882,558,000