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Cover Page - USD ($)
 12 Months Ended
Dec. 28, 2019
Jan. 31, 2020
Jun. 29, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 28, 2019    
Document Transition Report false    
Entity File Number 1-14225    
Entity Registrant Name HNI Corporation    
Entity Incorporation, State or Country Code IA    
Entity Tax Identification Number 42-0617510    
Entity Address, Address Line One 600 East Second Street    
Entity Address, Address Line Two P. O. Box 1109    
Entity Address, City or Town Muscatine    
Entity Address, State or Province IA    
Entity Address, Postal Zip Code 52761-0071    
City Area Code 563    
Local Phone Number 272-7400    
Title of 12(b) Security Common Stock    
Trading Symbol HNI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,090,014,357
Entity Common Stock, Share Outstanding   42,554,705  
Documents Incorporated by Reference
Portions of the Registrant's Definitive Proxy Statement on Schedule 14A for the Annual Meeting of Shareholders to be held on May 5, 2020 are incorporated by reference into Part III.
    
Entity Central Index Key 0000048287    
Current Fiscal Year End Date --12-28    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false