Janus International Group Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Share Repurchase Program - Schedule of Share Repurchase Activity (Details)

Share Repurchase Program - Schedule of Share Repurchase Activity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Oct. 03, 2026	Jul. 04, 2026	Apr. 04, 2026	Sep. 27, 2025	Jun. 28, 2025	Mar. 29, 2025	Oct. 03, 2026	Sep. 27, 2025
Equity, Class of Treasury Stock [Line Items]
Share repurchase cost (including excise taxes)	$ 25.3	$ 1.9	$ 15.7	$ 0.8	$ 10.1	$ 5.1
Common Stock
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	4,977,659	367,096	2,862,680	81,927	1,221,672	621,643	8,207,435	1,925,242
Share repurchase cost (including excise taxes)	$ 25.3			$ 0.8			$ 42.9	$ 16.0

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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+ Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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