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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disclosure of operating segments [line items] |  |
Operating income | $ 474.0 | $ 284.2
Restructuring, integration and acquisition costs | 64.3 | 146.9
Impairment reversal of non-financial assets following their repurposing and optimization | 9.8 | 0.0
Cloud computing transition adjustment (Note 4) | 0.0 | 13.4
Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Impairment reversal of non-financial assets following their repurposing and optimization | 3.0 |
Cloud computing transition adjustment (Note 4) |  | 11.6
Defense and Security |  |
Disclosure of operating segments [line items] |  |
Impairment reversal of non-financial assets following their repurposing and optimization | 6.8 |
Operating segments |  |
Disclosure of operating segments [line items] |  |
Operating income | 474.0 | 284.2
Restructuring, integration and acquisition costs | 64.3 | 146.9
Impairment reversal of non-financial assets following their repurposing and optimization | 9.8 | 0.0
Cloud computing transition adjustment (Note 4) | 0.0 | 13.4
Adjusted segment operating income | 548.1 | 444.5
Operating segments | Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Operating income | 430.3 | 224.1
Restructuring, integration and acquisition costs | 52.0 | 79.0
Impairment reversal of non-financial assets following their repurposing and optimization | 3.0 | 0.0
Cloud computing transition adjustment (Note 4) | 0.0 |
Adjusted segment operating income | 485.3 | 314.7
Operating segments | Defense and Security |  |
Disclosure of operating segments [line items] |  |
Operating income | 35.7 | 56.0
Restructuring, integration and acquisition costs | 10.6 | 61.4
Impairment reversal of non-financial assets following their repurposing and optimization | 6.8 | 0.0
Cloud computing transition adjustment (Note 4) | 0.0 | 1.8
Adjusted segment operating income | 53.1 | 119.2
Operating segments | Healthcare |  |
Disclosure of operating segments [line items] |  |
Operating income | 8.0 | 4.1
Restructuring, integration and acquisition costs | 1.7 | 6.5
Impairment reversal of non-financial assets following their repurposing and optimization | 0.0 | 0.0
Cloud computing transition adjustment (Note 4) | 0.0 | 0.0
Adjusted segment operating income | $ 9.7 | $ 10.6

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