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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 01, 2023
Jun. 30, 2023
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Numerator:          
Numerator for both basic and diluted EPS attributable to HNI Corporation net income     $ 49.2 $ 123.9 $ 59.8
Denominators:          
Denominator for basic EPS weighted-average common shares outstanding (in shares)     44.5 41.7 43.4
Potentially dilutive shares from stock-based compensation plans (in shares)     0.8 0.5 0.5
Denominator for diluted EPS (in shares)     45.4 42.2 44.0
Earnings per share - basic (in dollars per share)     $ 1.11 $ 2.97 $ 1.38
Earnings per share - diluted (in dollars per share)     $ 1.09 $ 2.94 $ 1.36
Kimball International, Inc | Common Stock          
Denominators:          
Number of shares exchanged (in shares) 4.7 4.7      
Stock Compensation Plan          
Denominators:          
Common stock equivalents excluded because their inclusion would be anti-dilutive (in shares)     2.1 2.0 1.6