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INTANGIBLE ASSETS - Goodwill Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period $ 2,663.3 $ 2,464.3
Business combinations (Note 3)   35.8
Disposal of discontinued operations (Note 2) (120.4)  
Impairment of goodwill (568.0) 0.0
Foreign currency exchange differences (3.6) 163.2
Goodwill at the end of the period 1,971.3 2,663.3
Discontinued operations    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 120.4 111.7
Business combinations (Note 3)   0.0
Disposal of discontinued operations (Note 2) (120.4)  
Impairment of goodwill 0.0  
Foreign currency exchange differences 0.0 8.7
Goodwill at the end of the period 0.0 120.4
Civil Aviation    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 1,125.6 1,046.8
Business combinations (Note 3)   25.6
Disposal of discontinued operations (Note 2) 0.0  
Impairment of goodwill 0.0  
Foreign currency exchange differences (4.8) 53.2
Goodwill at the end of the period 1,120.8 1,125.6
Defense and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 1,417.3 1,305.8
Business combinations (Note 3)   10.2
Disposal of discontinued operations (Note 2) 0.0  
Impairment of goodwill (568.0)  
Foreign currency exchange differences 1.2 101.3
Goodwill at the end of the period $ 850.5 $ 1,417.3