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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Restructuring, Integration and Acquisition costs [Abstract] |  |
Integration and acquisition costs | $ 66.3 | $ 87.8
Impairment of non-financial assets – net | 2.3 | 37.1
Severances and other employee related costs | 2.7 | 6.9
Other costs | 2.8 | 15.1
Impairment reversal of non-financial assets following their repurposing and optimization | (9.8) | 0.0
Restructuring, integration and acquisition costs | $ 64.3 | $ 146.9

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