CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Net sales	$ 417,456	$ 526,026	$ 886,161	$ 1,005,482
Cost of sales	266,551	333,437	559,238	643,279
Gross profit	150,905	192,589	326,923	362,203
Selling and administrative expenses	136,063	168,411	303,148	334,348
Impairment and restructuring charges	0	930	32,661	930
Operating income (loss)	14,842	23,248	(8,886)	26,925
Interest expense, net	1,943	2,480	3,754	4,591
Income (loss) before income taxes	12,899	20,768	(12,640)	22,334
Income taxes	345	4,957	(1,299)	5,503
Net income (loss)	12,554	15,811	(11,341)	16,831
Less: Net income (loss) attributable to non-controlling interest	(2)	1	(2)	(1)
Net income (loss) attributable to HNI Corporation	$ 12,556	$ 15,810	$ (11,339)	$ 16,832
Average number of common shares outstanding – basic (in shares)	42,640	43,218	42,634	43,376
Net income (loss) attributable to HNI Corporation per common share – basic (in dollars per share)	$ 0.29	$ 0.37	$ (0.27)	$ 0.39
Average number of common shares outstanding – diluted (in shares)	42,929	43,634	42,634	43,860
Net income (loss) attributable to HNI Corporation per common share – diluted (in dollars per share)	$ 0.29	$ 0.36	$ (0.27)	$ 0.38
Foreign currency translation adjustments	$ 45	$ (333)	$ (555)	$ 630
Change in unrealized gains (losses) on marketable securities, net of tax	244	126	302	216
Change in pension and post-retirement liability, net of tax	0	0	0	(1,185)
Change in derivative financial instruments, net of tax	(283)	(1,327)	(2,499)	(1,636)
Other comprehensive income (loss), net of tax	6	(1,534)	(2,752)	(1,975)
Comprehensive income (loss)	12,560	14,277	(14,093)	14,856
Less: Comprehensive income (loss) attributable to non-controlling interest	(2)	1	(2)	(1)
Comprehensive income (loss) attributable to HNI Corporation	$ 12,562	$ 14,276	$ (14,091)	$ 14,857