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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]    
Total capital expenditures $ 444.1 $ 477.7
Operating segments | Discontinued operations    
Disclosure of operating segments [line items]    
Total capital expenditures 0.0 13.7
Operating segments | Civil Aviation    
Disclosure of operating segments [line items]    
Total capital expenditures 296.3 335.3
Operating segments | Defense and Security    
Disclosure of operating segments [line items]    
Total capital expenditures $ 147.8 $ 128.7