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Document and Entity Information
 9 Months Ended
Sep. 28, 2019
shares
Cover [Abstract]  
Entity Registrant Name SLEEP NUMBER CORP
Trading Symbol SNBR
Entity Central Index Key 0000827187
Current Fiscal Year End Date --12-28
Entity Filer Category Large Accelerated Filer
Document Type 10-Q
Document Period End Date Sep. 28, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q3
Amendment Flag false
Entity Small Business false
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 28,427,000
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Title of 12(b) Security Common Stock, par value $0.01 per share
Entity Incorporation, State or Country Code MN
Security Exchange Name NASDAQ
Entity Shell Company false
Document Quarterly Report true
Document Transition Report false
Entity File Number 000-25121
Entity Tax Identification Number 41-1597886
Entity Address, Address Line One 1001 Third Avenue South
Entity Address, City or Town Minneapolis
Entity Address, State or Province MN
Entity Address, Postal Zip Code 55404
City Area Code 763
Local Phone Number 551-7000