Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Income Statement [Abstract]
Net sales	$ 598.8	$ 586.7	$ 1,792.9	$ 1,581.5
Cost of sales	389.3	391.4	1,165.9	1,018.3
Gross profit	209.5	195.4	627.0	563.2
Selling and administrative expenses	178.2	169.1	544.3	489.6
Gain on sale of subsidiary	(50.6)	0.0	(50.6)	0.0
Impairment charges	0.0	0.0	1.0	0.0
Operating income	81.9	26.2	132.2	73.5
Interest expense, net	2.4	1.9	6.5	5.5
Income before income taxes	79.5	24.4	125.8	68.1
Income taxes	16.4	5.2	18.2	16.5
Net income	63.1	19.2	107.6	51.6
Less: Net income (loss) attributable to non-controlling interest	(0.0)	0.0	(0.0)	(0.0)
Net income attributable to HNI Corporation	$ 63.1	$ 19.2	$ 107.6	$ 51.6
Average number of common shares outstanding – basic (in shares)	41.3	43.8	41.8	43.6
Net income attributable to HNI Corporation per common share – basic (in dollars per share)	$ 1.53	$ 0.44	$ 2.57	$ 1.18
Average number of common shares outstanding – diluted (in shares)	41.8	44.3	42.3	44.0
Net income attributable to HNI Corporation per common share – diluted (in dollars per share)	$ 1.51	$ 0.43	$ 2.54	$ 1.17
Foreign currency translation adjustments	$ (3.7)	$ 0.0	$ (5.5)	$ 0.1
Change in unrealized gains (losses) on marketable securities, net of tax	(0.3)	(0.0)	(0.8)	(0.2)
Change in derivative financial instruments, net of tax	(0.1)	0.2	0.9	0.6
Other comprehensive income (loss), net of tax	(4.0)	0.2	(5.4)	0.5
Comprehensive income	59.1	19.3	102.2	52.1
Less: Comprehensive income (loss) attributable to non-controlling interest	(0.0)	0.0	(0.0)	(0.0)
Comprehensive income attributable to HNI Corporation	$ 59.1	$ 19.3	$ 102.2	$ 52.1