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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Reconciliation of adjusted segment operating income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of operating segments [line items] |  |
Operating income | $ 48.4 | $ 537.1
Restructuring, integration and acquisition costs | 124.0 | 15.8
Impairment of goodwill | 0.0 | 37.5
Impairment loss on non-financial assets, COVID-19 | 103.5 | 0.0
Income, Government contributions relating to Covid-19 | 127.4 |
Defence and Security |  |
Disclosure of operating segments [line items] |  |
Restructuring, integration and acquisition costs |  | 9.7
Operating segments |  |
Disclosure of operating segments [line items] |  |
Operating income | 48.4 | 537.1
Restructuring, integration and acquisition costs | 124.0 | 15.8
Impairment of goodwill | 0.0 | 37.5
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 108.2 | 0.0
Adjusted segment operating income (loss) | 280.6 | 590.4
Operating segments | Civil Aviation Training Solutions |  |
Disclosure of operating segments [line items] |  |
Operating income | 6.5 | 473.3
Restructuring, integration and acquisition costs | 76.1 | 6.1
Impairment of goodwill | 0.0 | 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 81.7 | 0.0
Adjusted segment operating income (loss) | 164.3 | 479.4
Operating segments | Defence and Security |  |
Disclosure of operating segments [line items] |  |
Operating income | 15.5 | 104.8
Restructuring, integration and acquisition costs | 45.0 | 9.7
Impairment of goodwill | 0.0 | 0.0
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 26.5 | 0.0
Adjusted segment operating income (loss) | 87.0 | 114.5
Operating segments | Healthcare |  |
Disclosure of operating segments [line items] |  |
Operating income | 26.4 | (41.0)
Restructuring, integration and acquisition costs | 2.9 | 0.0
Impairment of goodwill | 0.0 | 37.5
Impairment and other gains and losses incurred in relation to the COVID-19 pandemic | 0.0 | 0.0
Adjusted segment operating income (loss) | $ 29.3 | $ (3.5)

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