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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
Apr. 01, 2023
Apr. 02, 2022
Numerator:    
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ 1.6 $ 14.2
Denominators:    
Denominator for basic EPS weighted-average common shares outstanding (in shares) 41.5 42.4
Potentially dilutive shares from stock-based compensation plans (in shares) 0.5 0.7
Denominator for diluted EPS (in shares) 42.1 43.1
Earnings per share - basic (in dollars per share) $ 0.04 $ 0.33
Earnings per share - diluted (in dollars per share) $ 0.04 $ 0.33