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OTHER (GAINS) AND LOSSES - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of detailed information about business combination [line items] |  |
Impairment loss on non-financial assets, COVID-19 | $ 103.5 | $ 0.0
Impairment of property, plant and equipment | 76.7 | 1.8
Other gains and losses, Net remeasurement gain | 12.7 |
Other gains and losses, Purchases of personal protective equipment | 7.4 |
Contingent consideration [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Gainsrecognised in profit or loss, fair value measurement, liabilities |  | $ 13.4
Civil Aviation Training Solutions |  |
Disclosure of detailed information about business combination [line items] |  |
Impairment of property, plant and equipment | 46.7 |
Impairment of intangible assets | 22.2 |
Inventory write-down | 11.2 |
Defence and Security |  |
Disclosure of detailed information about business combination [line items] |  |
Impairment of intangible assets | 12.6 |
Inventory write-down | $ 10.8 |

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