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RESTRUCTURING, INTEGRATION AND ACQUISITION COSTS - Analysis (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Restructuring, Integration and Acquisition costs [Abstract] |  |
Integration and acquisition costs | $ 6.9 | $ 6.1
Impairment of non-financial assets | 59.5 | 7.0
Severances and other employee related costs | 42.9 | 2.7
Other costs | 14.7 | 0.0
Total restructuring, integration and acquisition costs | $ 124.0 | $ 15.8

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