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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Integration and acquisition costs | $ 6.9 | $ 6.1
Restructuring, integration and acquisition costs | 124.0 | 15.8
Defence and Security |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Restructuring, integration and acquisition costs |  | 9.7
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 | $ 4.3 |
Bombardier's BAT Business |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |
Integration and acquisition costs |  | $ 6.1

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