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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Numerator:      
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ 89,795 $ 85,577 $ 105,436
Denominators:      
Denominator for basic EPS weighted- average common shares outstanding 43,839,004 44,413,941 44,285,298
Potentially dilutive shares from stock-based compensation plans (shares) 1,001,000 1,088,000 1,156,000
Denominator for diluted EPS (shares) 44,839,813 45,502,219 45,440,653
Earnings per share - basic (in dollars per share) $ 2.05 $ 1.93 $ 2.38
Earnings per share - diluted (in dollars per share) $ 2.00 $ 1.88 $ 2.32
Antidilutive securities excluding from computation of earnings per share 809,420 416,142 493,202