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INCOME TAXES - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Feb. 16, 2024
Mar. 31, 2025
Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current year   $ 56.7 $ 74.0
Deferred tax expense (income) relating to origination and reversal of temporary differences   (51.5) 233.3
Income tax recovery $ 10.2   18.7
Net deferred tax assets   148.7 199.4
Deferred income tax liability   3,456.4 3,065.5
Deductible temporary differences   130.4 139.6
Unrecognized   214.0  
Current tax expense (income), related to Pillar Two income taxes   2.6  
Strategic Aerospace and Defence Initiative (SADI) Program      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current year     57.4
Deferred tax expense (income) relating to origination and reversal of temporary differences     61.9
No expiry date      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unrecognized   167.4  
Capital losses | No expiry date      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unrecognized   $ 156.2 $ 180.2