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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