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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 6 Months Ended
Jul. 01, 2023
Jul. 02, 2022
Jul. 01, 2023
Jul. 02, 2022
Apr. 01, 2023
Dec. 31, 2022
Apr. 02, 2022
Jan. 01, 2022
Numerator:                
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ (12.8) $ 30.3 $ (11.3) $ 44.5        
Denominators:                
Denominator for basic EPS weighted-average common shares outstanding (in shares) 43.3 41.8 42.4 42.1        
Potentially dilutive shares from stock-based compensation plans (in shares) 0.0 0.6 0.0 0.6        
Denominator for diluted EPS (in shares) 43.3 42.4 42.4 42.7        
Earnings per share - basic (in dollars per share) $ (0.30) $ 0.73 $ (0.27) $ 1.06        
Earnings per share - diluted (in dollars per share) $ (0.30) $ 0.72 $ (0.27) $ 1.04        
Stockholders' equity, including portion attributable to noncontrolling interest $ 715.3 $ 562.0 $ 715.3 $ 562.0 $ 613.2 $ 616.8 $ 582.0 $ 590.0