| Acquired Intangible Assets and Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended | |
|---|---|---|
| Dec. 30, 2023 | Dec. 31, 2022 | |
| Goodwill [Roll Forward] | ||
| Beginning balance | $ 368.2 | $ 369.3 | 
| Foreign Currency Translation Adjustment | 0.4 | (1.2) | 
| Access Control Technologies, LLC Acquisition Adjustment | 0.1 | |
| Ending balance | 368.6 | 368.2 | 
| Janus North America | ||
| Goodwill [Roll Forward] | ||
| Beginning balance | 357.0 | 356.9 | 
| Foreign Currency Translation Adjustment | 0.0 | 0.0 | 
| Access Control Technologies, LLC Acquisition Adjustment | 0.1 | |
| Ending balance | 357.0 | 357.0 | 
| Janus International | ||
| Goodwill [Roll Forward] | ||
| Beginning balance | 11.2 | 12.4 | 
| Foreign Currency Translation Adjustment | 0.4 | (1.2) | 
| Access Control Technologies, LLC Acquisition Adjustment | 0.0 | |
| Ending balance | $ 11.6 | $ 11.2 | 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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