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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Tax [Abstract]    
Earnings (loss) before income taxes $ 513.7 $ (390.4)
Canadian statutory income tax rates (in percent) 26.50% 26.50%
Income taxes at Canadian statutory rates $ 136.2 $ (103.5)
Effect of differences in tax rates in other jurisdictions 1.8 7.4
Non-deductible impairment of goodwill 0.0 41.6
Tax benefits not previously recognized and unrecognized tax benefits (6.8) 18.3
Non-taxable gain on fair value remeasurement of SIMCOM (21.9) 0.0
Non-taxable revenues 0.0 (4.1)
Tax impact on after tax profit of equity accounted investees (18.5) (18.8)
Prior years' tax adjustments 2.8 (14.4)
Other 5.1 0.7
Income tax expense (recovery) $ 98.7 $ (72.8)
Effective tax rate (in percent) 19.00% 19.00%