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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Products and Services Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of operating segments [line items] |  |
Revenue | $ 4,707.9 | $ 4,282.8
Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Revenue | 2,709.3 | 2,435.8
Defense and Security |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,998.6 | 1,847.0
Products |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,871.4 | 1,495.3
Products | Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Revenue | 963.7 | 786.6
Products | Defense and Security |  |
Disclosure of operating segments [line items] |  |
Revenue | 907.7 | 708.7
Training, software and services |  |
Disclosure of operating segments [line items] |  |
Revenue | 2,836.5 | 2,787.5
Training, software and services | Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,745.6 | 1,649.2
Training, software and services | Defense and Security |  |
Disclosure of operating segments [line items] |  |
Revenue | $ 1,090.9 | $ 1,138.3

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