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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Integration and acquisition costs | $ 66.3 | $ 87.8
Impairment reversal of non-financial assets following their repurposing and optimization | 9.8 | 0.0
Defense and Security |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Impairment reversal of non-financial assets following their repurposing and optimization | 6.8 |
Civil Aviation |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Impairment reversal of non-financial assets following their repurposing and optimization | 3.0 |
L3Harris' Military Training business |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Integration and acquisition costs | 17.6 | 63.5
Sabre AirCentre airline operations portfolio |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Integration and acquisition costs | $ 48.9 | $ 18.1

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