Goodwill and Other Intangible Assets - Schedule of Activity in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	Sep. 27, 2025	Dec. 28, 2024
Goodwill [Line Items]
Goodwill	$ 506.8	$ 520.7
Accumulated impairment losses	(64.7)	(78.6)
Goodwill, net	442.1	442.1
Goodwill derecognized	(13.9)
Accumulated impairment losses derecognized	13.9
Workplace Furnishings
Goodwill [Line Items]
Goodwill	284.4	298.3
Accumulated impairment losses	(64.6)	(78.5)
Goodwill, net	219.8	219.8
Goodwill derecognized	(13.9)
Accumulated impairment losses derecognized	13.9
Residential Building Products
Goodwill [Line Items]
Goodwill	222.4	222.4
Accumulated impairment losses	(0.1)	(0.1)
Goodwill, net	222.3	$ 222.3
Goodwill derecognized	0.0
Accumulated impairment losses derecognized	$ 0.0

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

HNI CORP 10-Q