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IMPAIRMENT OF NON-FINANCIAL ASSETS - Changes In Goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of reconciliation of changes in goodwill [line items]    
Acquisition of subsidiaries $ 219.8 $ 31.9
Impairment (51.8) (40.7)
Foreign currency exchange differences (117.9) 49.7
Civil Aviation Training Solutions    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start   630.6
Acquisition of subsidiaries 169.0 19.2
Impairment   0.0
Foreign currency exchange differences (47.1) 17.5
Defence and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start   290.8
Acquisition of subsidiaries 0.0 0.0
Impairment   0.0
Foreign currency exchange differences (21.4) 9.9
Healthcare    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start   146.3
Acquisition of subsidiaries 0.0 0.9
Impairment   (37.5)
Foreign currency exchange differences (12.6) 7.6
Goodwill    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 1,085.3 1,067.7
Acquisition of subsidiaries 169.0 20.1
Impairment 0.0 (37.5)
Foreign currency exchange differences (81.1) 35.0
Goodwill, end 1,173.2 1,085.3
Goodwill | Civil Aviation Training Solutions    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 667.3  
Goodwill, end 789.2 667.3
Goodwill | Defence and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 300.7  
Goodwill, end 279.3 300.7
Goodwill | Healthcare    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill, start 117.3  
Impairment   (37.5)
Goodwill, end $ 104.7 $ 117.3