Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Schedule of Disaggregation of Revenue (Details)

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Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Disaggregation of Revenue [Line Items]        
Revenue $ 248.4 $ 270.6 $ 502.9 $ 522.5
Product revenues        
Disaggregation of Revenue [Line Items]        
Revenue 205.8 232.8 420.9 448.2
Service revenues        
Disaggregation of Revenue [Line Items]        
Revenue 42.6 37.8 82.0 74.3
Operating Segments | Janus North America        
Disaggregation of Revenue [Line Items]        
Revenue 230.8 249.7 471.3 480.2
Operating Segments | Janus North America | Self Storage-New Construction        
Disaggregation of Revenue [Line Items]        
Revenue 95.5 84.7 199.7 149.3
Operating Segments | Janus North America | Self Storage-R3        
Disaggregation of Revenue [Line Items]        
Revenue 58.7 77.7 127.0 160.1
Operating Segments | Janus North America | Commercial and Others        
Disaggregation of Revenue [Line Items]        
Revenue 76.6 87.3 144.6 170.8
Operating Segments | Janus North America | Product revenues transferred at a point in time | Product revenues        
Disaggregation of Revenue [Line Items]        
Revenue 168.8 193.4 343.0 363.0
Operating Segments | Janus North America | Service revenues transferred over time | Product revenues        
Disaggregation of Revenue [Line Items]        
Revenue 26.6 27.7 59.3 60.6
Operating Segments | Janus North America | Service revenues transferred over time | Service revenues        
Disaggregation of Revenue [Line Items]        
Revenue 35.4 28.6 69.0 56.6
Operating Segments | Janus International        
Disaggregation of Revenue [Line Items]        
Revenue 18.0 21.2 32.7 42.8
Operating Segments | Janus International | Self Storage-New Construction        
Disaggregation of Revenue [Line Items]        
Revenue 15.2 18.5 27.6 37.1
Operating Segments | Janus International | Self Storage-R3        
Disaggregation of Revenue [Line Items]        
Revenue 2.8 2.7 5.1 5.7
Operating Segments | Janus International | Product revenues transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue 10.8 12.0 19.8 25.1
Operating Segments | Janus International | Service revenues transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue 7.2 9.2 12.9 17.7
Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue $ (0.4) $ (0.3) $ (1.1) $ (0.5)