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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Disclosure of operating segments [line items] |  |  |
Operating income (loss) |  | $ (185.4) | $ 466.0
Restructuring, integration and acquisition costs |  | 131.4 | 62.6
Impairment of goodwill |  | 568.0 | 0.0
Impairment of technology and other non-financial assets (Note 5) | $ 35.7 | 35.7 | 0.0
Impairment reversal of non-financial assets following their repurposing and optimization |  | 0.0 | 9.8
Civil Aviation |  |  |
Disclosure of operating segments [line items] |  |  |
Impairment of goodwill |  | 0.0 |
Impairment reversal of non-financial assets following their repurposing and optimization |  |  | 3.0
Defense and Security |  |  |
Disclosure of operating segments [line items] |  |  |
Impairment of goodwill |  | 568.0 |
Impairment reversal of non-financial assets following their repurposing and optimization |  |  | 6.8
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Operating income (loss) |  | (185.4) | 466.0
Restructuring, integration and acquisition costs |  | 131.4 | 62.6
Impairment of goodwill |  | 568.0 | 0.0
Impairment of technology and other non-financial assets (Note 5) |  | 35.7 | 0.0
Impairment reversal of non-financial assets following their repurposing and optimization |  | 0.0 | 9.8
Adjusted segment operating income |  | 549.7 | 538.4
Operating segments | Civil Aviation |  |  |
Disclosure of operating segments [line items] |  |  |
Operating income (loss) |  | 442.0 | 430.3
Restructuring, integration and acquisition costs |  | 106.9 | 52.0
Impairment of goodwill |  | 0.0 | 0.0
Impairment of technology and other non-financial assets (Note 5) |  | 0.0 | 0.0
Impairment reversal of non-financial assets following their repurposing and optimization |  | 0.0 | 3.0
Adjusted segment operating income |  | 548.9 | 485.3
Operating segments | Defense and Security |  |  |
Disclosure of operating segments [line items] |  |  |
Operating income (loss) |  | (627.4) | 35.7
Restructuring, integration and acquisition costs |  | 24.5 | 10.6
Impairment of goodwill |  | 568.0 | 0.0
Impairment of technology and other non-financial assets (Note 5) |  | 35.7 | 0.0
Impairment reversal of non-financial assets following their repurposing and optimization |  | 0.0 | 6.8
Adjusted segment operating income |  | $ 0.8 | $ 53.1

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