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INCOME TAXES - Components of the Provision for the Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Current income tax expense :    
Current year $ 56.7 $ 74.0
Prior years' tax adjustments (2.7) 68.2
Deferred income tax expense (recovery):    
Tax benefit not previously recognized used to reduce the deferred tax expense (6.8) 18.3
Origination and reversal of temporary differences 51.5 (233.3)
Income tax expense (recovery) $ 98.7 $ (72.8)