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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Products and Services Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 3,623.2 [1] $ 3,304.1
Simulation products    
Disclosure of operating segments [line items]    
Revenue 1,537.0 1,473.8
Training and services    
Disclosure of operating segments [line items]    
Revenue $ 2,086.2 $ 1,830.3
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.