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INTANGIBLE ASSETS - Goodwill Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period $ 1,971.3 $ 2,663.3
Disposal of discontinued operations (Note 3)   (120.4)
Impairment 0.0 (568.0)
Business combinations (Note 2 and 7) 350.2  
Foreign currency exchange differences 118.2 (3.6)
Goodwill at the end of the period 2,439.7 1,971.3
Discontinued operations    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 0.0 120.4
Disposal of discontinued operations (Note 3)   (120.4)
Impairment   0.0
Business combinations (Note 2 and 7) 0.0  
Foreign currency exchange differences 0.0 0.0
Goodwill at the end of the period 0.0 0.0
Civil Aviation    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 1,120.8 1,125.6
Disposal of discontinued operations (Note 3)   0.0
Impairment   0.0
Business combinations (Note 2 and 7) 350.2  
Foreign currency exchange differences 69.8 (4.8)
Goodwill at the end of the period 1,540.8 1,120.8
Defense and Security    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill at the start of the period 850.5 1,417.3
Disposal of discontinued operations (Note 3)   0.0
Impairment   (568.0)
Business combinations (Note 2 and 7) 0.0  
Foreign currency exchange differences 48.4 1.2
Goodwill at the end of the period $ 898.9 $ 850.5