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

Quarterly report [Sections 13 or 15(d)]

Cover
- Cover Page
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Summary of Significant Accounting Policies - Narrative (Details)

v3.25.3

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025 USD ($)	Sep. 28, 2024 USD ($)	Sep. 27, 2025 USD ($) segment	Sep. 28, 2024 USD ($)
Product Information [Line Items]
Accounts payable			$ 1.1	$ (8.6)
Cost of revenues	$ (133.6)	$ (138.9)	(397.1)	(422.4)
Interest income	$ 1.6	0.8	$ 3.9	1.2
Product warranty obligation, term	10 years		10 years
Number of operating segments \| segment			2
Number of reportable segments \| segment			2
Service revenues
Product Information [Line Items]
Cost of revenues	$ (29.9)	(36.3)	$ (96.6)	(89.9)
Revision of Prior Period, Error Correction, Adjustment \| Service revenues
Product Information [Line Items]
Accounts payable		0.0		2.5
Cost of revenues		$ 0.0		$ 2.5
Inventory Concentration Risk \| Customer One \| Customer Concentration Risk
Product Information [Line Items]
Concentration percentage			17.00%	10.00%
Minimum
Product Information [Line Items]
Product warranty obligation, term	1 year		1 year
Maximum
Product Information [Line Items]
Product warranty obligation, term	3 years		3 years

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