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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year $ 4,302.6 $ 4,588.9
Other comprehensive (loss) income 191.8 (1.4)
Balances, end of year 4,976.0 4,302.6
Foreign currency exchange differences on translation of foreign operations    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 174.5 182.8
Other comprehensive (loss) income 243.2 (8.3)
Balances, end of year 417.7 174.5
Net change in cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (19.2) (14.3)
Other comprehensive (loss) income (15.4) (4.9)
Balances, end of year (34.6) (19.2)
Net changes in financial assets carried at FVOCI    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (1.3) (1.3)
Other comprehensive (loss) income 0.0 0.0
Balances, end of year (1.3) (1.3)
Accumulated other comprehensive income    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 154.0 167.2
Other comprehensive (loss) income 227.8 (13.2)
Other comprehensive loss (income) excluding cash flow hedges 227.8 (13.2)
Balances, end of year $ 381.8 $ 154.0