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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Tax [Abstract]    
Earnings before income taxes $ 296.3 $ 153.6
Canadian statutory income tax rates (in percent) 26.53% 26.54%
Income taxes at Canadian statutory rates $ 78.6 $ 40.8
Effect of differences in tax rates in other jurisdictions (3.5) (16.8)
Unrecognized tax benefits and tax benefits not previously recognized 1.4 2.2
(Non-taxable revenues) Non-deductible expenses (2.8)  
(Non-taxable revenues) Non-deductible expenses   1.5
Tax impact on after-tax profit of equity accounted investees (13.0) (12.1)
Prior years' tax adjustments 0.5 (1.5)
Other 3.2 (10.5)
Income tax expense $ 64.4 $ 3.6
Effective tax rate (in percent) 22.00% 2.00%