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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2020
CAD ($)
business_segments
Mar. 31, 2019
CAD ($)
Disclosure of operating segments [abstract]    
Number of operating segments | business_segments 3  
Royalty agreement, term 20 years  
Disclosure of operating segments [line items]    
Addition of assets through the monetization of royalties $ 0.0 [1] $ 202.7
Intangible assets | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Addition of assets through the monetization of royalties 156.7  
Property, plant and equipment | Civil Aviation Training Solutions    
Disclosure of operating segments [line items]    
Addition of assets through the monetization of royalties $ 46.0  
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.