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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Restructuring, Integration and Acquisition costs [Abstract] |  |
Integration and acquisition costs | $ 79.9 | $ 65.8
Severances and other employee related costs | 31.2 | 2.0
Impairment of non-financial assets – net | 19.2 | 1.8
Other costs | 1.1 | 2.8
Impairment reversal of non-financial assets following their repurposing and optimization | 0.0 | (9.8)
Restructuring, integration and acquisition costs | $ 131.4 | $ 62.6

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