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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 29, 2018
Feb. 01, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name HNI CORP    
Entity Central Index Key 0000048287    
Current Fiscal Year End Date --12-29    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Type 10-K    
Document Period End Date Dec. 29, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Share Outstanding   43,492,622  
Entity Public Float     $ 1,159,656,498