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IMPAIRMENT OF NON-FINANCIAL ASSETS - Changes In Goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period $ 2,464.3 $ 1,173.2
Business combinations (Note 2)   1,812.4
Foreign currency exchange differences 223.2 (33.5)
Goodwill at the end of the period 2,663.3 2,464.3
Civil Aviation    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 1,046.8 789.2
Goodwill at the end of the period 1,125.6 1,046.8
Defense and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 1,305.8 279.3
Goodwill at the end of the period 1,417.3 1,305.8
Healthcare    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 111.7 104.7
Goodwill at the end of the period 120.4 111.7
Goodwill    
Disclosure of reconciliation of changes in goodwill [line items]    
Business combinations (Note 2)   1,316.8
Foreign currency exchange differences $ 163.2 $ (25.7)