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Document and Entity Information
 6 Months Ended
Jun. 29, 2019
shares
Document And Entity Information [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 Jun. 29, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Amendment Flag false
Entity Small Business false
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 29,323,000
Entity Current Reporting Status Yes
Entity Shell Company false
Entity File Number 000-25121
Entity Tax Identification Number 411597886
Entity Address, Address Line One 1001 Third Avenue South
Entity Address, City or Town Minneapolis
Entity Address, State or Province Minnesota
Entity Address, Postal Zip Code 55404
City Area Code 763
Local Phone Number 551-7000