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INCOME TAXES - Components of the Provision for the Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Current income tax expense :    
Current year $ 74.0 $ 49.9
Prior years' tax adjustments 68.2 0.7
Deferred income tax (recovery) expense:    
Tax benefit not previously recognized used to reduce the deferred tax expense 18.3 (2.2)
Origination and reversal of temporary differences (233.3) 14.2
Income tax (recovery) expense $ (72.8) $ 62.6