Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Income Statement [Abstract]
Net sales	$ 599.8	$ 588.0
Cost of sales	361.4	355.1
Gross profit	238.4	232.8
Selling and administrative expenses	207.6	203.1
Restructuring and impairment charges	6.4	0.1
Operating income	24.4	29.7
Interest expense, net	5.5	7.6
Income before income taxes	18.9	22.0
Income taxes	5.0	4.3
Net income	13.9	17.7
Less: Net income (loss) attributable to non-controlling interest	0.0	0.0
Net income attributable to HNI Corporation	$ 13.9	$ 17.7
Average number of common shares outstanding – basic (in shares)	47.0	47.1
Net income attributable to HNI Corporation per common share – basic (in dollars per share)	$ 0.30	$ 0.38
Average number of common shares outstanding – diluted (in shares)	48.0	48.1
Net income attributable to HNI Corporation per common share – diluted (in dollars per share)	$ 0.29	$ 0.37
Foreign currency translation adjustments	$ (0.1)	$ 0.0
Change in unrealized gains (losses) on marketable securities, net of tax	0.1	0.0
Change in derivative financial instruments, net of tax	(0.6)	1.4
Other comprehensive income (loss), net of tax	(0.5)	1.4
Comprehensive income	13.4	19.0
Less: Comprehensive income (loss) attributable to non-controlling interest	0.0	0.0
Comprehensive income attributable to HNI Corporation	$ 13.4	$ 19.0