v3.26.1
Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]      
Revenue $ 4,835.8 $ 3,877.5 $ 3,936.3
Siding & Trim      
Disaggregation of Revenue [Line Items]      
Revenue 2,963.1 2,863.3 2,891.4
Deck, Rail & Accessories      
Disaggregation of Revenue [Line Items]      
Revenue 795.2 0.0 0.0
Australia & New Zealand      
Disaggregation of Revenue [Line Items]      
Revenue 520.6 519.9 562.8
Europe      
Disaggregation of Revenue [Line Items]      
Revenue $ 556.9 $ 494.3 $ 482.1