COVER PAGE	9 Months Ended
	Sep. 26, 2020 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 26, 2020
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 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 Common Stock, Shares Outstanding	42,714,650
Entity Central Index Key	0000048287
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--01-02