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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disclosure of operating segments [line items] |  |
Operating income | $ 284.2 | $ 48.4
Restructuring, integration and acquisition costs | 146.9 | 124.0
Cloud computing transition adjustment (Note 5) | 13.4 | 0.0
Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Cloud computing transition adjustment (Note 5) |  | 0.0
Operating segments |  |
Disclosure of operating segments [line items] |  |
Operating income | 284.2 | 48.4
Restructuring, integration and acquisition costs | 146.9 | 124.0
Cloud computing transition adjustment (Note 5) | 13.4 | 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 0.0 | 108.2
Adjusted segment operating income | 444.5 | 280.6
Operating segments | Civil Aviation |  |
Disclosure of operating segments [line items] |  |
Operating income | 224.1 | 6.5
Restructuring, integration and acquisition costs | 79.0 | 76.1
Cloud computing transition adjustment (Note 5) | 11.6 |
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 0.0 | 81.7
Adjusted segment operating income | 314.7 | 164.3
Operating segments | Defense and Security |  |
Disclosure of operating segments [line items] |  |
Operating income | 56.0 | 15.5
Restructuring, integration and acquisition costs | 61.4 | 45.0
Cloud computing transition adjustment (Note 5) | 1.8 | 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 0.0 | 26.5
Adjusted segment operating income | 119.2 | 87.0
Operating segments | Healthcare |  |
Disclosure of operating segments [line items] |  |
Operating income | 4.1 | 26.4
Restructuring, integration and acquisition costs | 6.5 | 2.9
Cloud computing transition adjustment (Note 5) | 0.0 | 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 0.0 | 0.0
Adjusted segment operating income | $ 10.6 | $ 29.3

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