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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Numerator:    
Numerator for both basic and diluted EPS attributable to HNI Corporation net income (loss) $ 15,019 $ (23,895)
Denominators:    
Denominator for basic EPS weighted-average common shares outstanding (in shares) 43,163 42,628
Potentially dilutive shares from stock-based compensation plans (in shares) 421 0
Denominator for diluted EPS (in shares) 43,584 42,628
Earnings per share - basic (in dollars per share) $ 0.35 $ (0.56)
Earnings per share - diluted (in dollars per share) $ 0.34 $ (0.56)