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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment $ 2,149.3 $ 1,803.9 $ 1,582.6 $ 1,582.6
Property, plant and equipment, pledged as security 84.5 121.3    
Simulators        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment $ 1,450.3 $ 1,185.9   $ 1,012.7
Useful lives or depreciation rates, property, plant and equipment 11 years 1 month 6 days 10 years 7 months 6 days    
Simulators under operating lease        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment $ 91.7 $ 114.8