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Earnings Per Share - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Jul. 01, 2023
Dec. 31, 2022
Jul. 02, 2022
Jan. 01, 2022
Numerator:                
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ 37.8 $ 63.1 $ 26.5 $ 107.6        
Denominators:                
Denominator for basic EPS weighted-average common shares outstanding (in shares) 46.6 41.3 43.8 41.8        
Potentially dilutive shares from stock-based compensation plans (in shares) 0.8 0.5 0.7 0.5        
Denominator for diluted EPS (in shares) 47.3 41.8 44.5 42.3        
Earnings per share - basic (in dollars per share) $ 0.81 $ 1.53 $ 0.60 $ 2.57        
Earnings per share - diluted (in dollars per share) $ 0.80 $ 1.51 $ 0.60 $ 2.54        
Stockholders' equity, including portion attributable to noncontrolling interest $ 741.1 $ 606.4 $ 741.1 $ 606.4 $ 715.3 $ 616.8 $ 562.0 $ 590.0