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INTANGIBLE ASSETS - Goodwill Reconciliation (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) 35.8 1,316.8
Foreign currency exchange differences 163.2 (25.7)
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
Business combinations (Note 2) 25.6 283.4
Foreign currency exchange differences 53.2 (25.8)
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
Business combinations (Note 2) 10.2 1,025.6
Foreign currency exchange differences 101.3 0.9
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
Business combinations (Note 2) 0.0 7.8
Foreign currency exchange differences 8.7 (0.8)
Goodwill at the end of the period $ 120.4 $ 111.7