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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Numerators:        
Numerator for both basic and diluted EPS attributable to HNI Corporation net income $ 33,813 $ 40,848 $ 74,685 $ 73,205
Denominators:        
Denominator for basic EPS weighted-average common shares outstanding 44,547,375 44,263,027 44,412,310 44,327,608
Potentially dilutive shares from stock-based compensation plans 1,298,000 1,140,000 1,076,000 1,189,000
Denominator for diluted EPS (shares) 45,844,566 45,402,537 45,488,067 45,516,521
Earnings per share - basic (in dollars per share) $ 0.76 $ 0.92 $ 1.68 $ 1.65
Earnings per share - diluted (in dollars per share) $ 0.74 $ 0.90 $ 1.64 $ 1.61
Earnings Per Share, Diluted, Other Disclosures [Abstract]        
Antidilutive securities excluded from computation of earnings per share (shares) 352,380 536,814 437,684 383,600