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Earnings Per Share - Schedule of Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Numerator:        
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ 47.5 $ 37.8 $ 101.2 $ 26.5
Denominators:        
Denominator for basic EPS weighted-average common shares outstanding (in shares) 47.7 46.6 47.3 43.8
Potentially dilutive shares from stock-based compensation plans (in shares) 1.1 0.8 1.0 0.7
Denominator for diluted EPS (in shares) 48.7 47.3 48.4 44.5
Earnings per share - basic (in dollars per share) $ 1.00 $ 0.81 $ 2.14 $ 0.60
Earnings per share - diluted (in dollars per share) $ 0.98 $ 0.80 $ 2.09 $ 0.60