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IMPAIRMENT OF NONFINANCIAL ASSETS - Changes In Goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]    
Acquisition of subsidiaries $ 31.9 $ 811.5
Impairment (40.7)  
Foreign currency exchange differences 49.7 (0.8)
Goodwill    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 1,067.7 625.5
Acquisition of subsidiaries 20.1 443.0
Impairment (37.5)  
Foreign currency exchange differences 35.0 (0.8)
Goodwill, end 1,085.3 1,067.7
Goodwill | Civil Aviation Training Solutions    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 630.6 266.8
Acquisition of subsidiaries 19.2 375.1
Impairment 0.0  
Foreign currency exchange differences 17.5 (11.3)
Goodwill, end 667.3 630.6
Goodwill | Defense and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 290.8 217.5
Acquisition of subsidiaries 0.0 67.9
Impairment 0.0  
Foreign currency exchange differences 9.9 5.4
Goodwill, end 300.7 290.8
Goodwill | Healthcare    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 146.3 141.2
Acquisition of subsidiaries 0.9 0.0
Impairment (37.5)  
Foreign currency exchange differences 7.6 5.1
Goodwill, end $ 117.3 $ 146.3