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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Restructuring, Integration and Acquisition costs [Abstract] |  |
Integration and acquisition costs | $ 87.8 | $ 6.9
Impairment of non-financial assets | 37.1 | 59.5
Severances and other employee related costs | 6.9 | 42.9
Other costs | 15.1 | 14.7
Total restructuring, integration and acquisition costs | $ 146.9 | $ 124.0

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