Janus International Group Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Business Combinations - Narrative (Details)

Business Combinations - Narrative (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended
	May 17, 2025	Dec. 28, 2024	Jan. 03, 2026	May 17, 2024	Dec. 30, 2023
Business Combination [Line Items]
Goodwill		$ 383.1	$ 383.9		$ 368.6
Smith T.M.C., Inc
Business Combination [Line Items]
Interest acquired				100.00%
Goodwill				$ 14.8
Revenue	$ 7.3	27.2
Net income	$ 0.8	$ 4.9

- 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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- Definition

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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