v3.26.1
OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Products and Services Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of operating segments [line items]    
Revenue $ 4,914.0 $ 4,707.9
Civil Aviation    
Disclosure of operating segments [line items]    
Revenue 2,741.6 2,709.3
Defense and Security    
Disclosure of operating segments [line items]    
Revenue 2,172.4 1,998.6
Products    
Disclosure of operating segments [line items]    
Revenue 2,027.1 1,871.4
Products | Civil Aviation    
Disclosure of operating segments [line items]    
Revenue 931.1 963.7
Products | Defense and Security    
Disclosure of operating segments [line items]    
Revenue 1,096.0 907.7
Training, software and services    
Disclosure of operating segments [line items]    
Revenue 2,886.9 2,836.5
Training, software and services | Civil Aviation    
Disclosure of operating segments [line items]    
Revenue 1,810.5 1,745.6
Training, software and services | Defense and Security    
Disclosure of operating segments [line items]    
Revenue $ 1,076.4 $ 1,090.9