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OTHER GAINS - NET - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about business combination [line items]    
Reorganization costs $ 9.7  
Inventory write-down 3.8  
Impairment of intangible assets 3.2  
Write-down of assets 9.4  
Impairment of property, plant and equipment 1.8 $ 4.9
Bombardier's BAT Business    
Disclosure of detailed information about business combination [line items]    
Restructuring, integration and acquisition costs 6.1 6.8
CAE Flight Training (India) Private Limited    
Disclosure of detailed information about business combination [line items]    
Remeasurement of investment, net of reorganization and others costs $ 13.4 3.7
Civil Aviation Training Solutions    
Disclosure of detailed information about business combination [line items]    
Impairment loss   $ 4.9