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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year $ 4,086.6 $ 3,212.8
Other comprehensive (loss) income 257.0 (13.2)
Balances, end of year 4,588.9 4,086.6
Foreign currency exchange differences on translation of foreign operations    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (29.4) 64.5
Other comprehensive (loss) income 212.2 (93.9)
Balances, end of year 182.8 (29.4)
Net change in cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (0.5) (5.2)
Other comprehensive (loss) income (13.8) 4.7
Balances, end of year (14.3) (0.5)
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) (1.2)
Other comprehensive (loss) income 0.0 (0.1)
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 (31.2) 58.1
Other comprehensive (loss) income 198.4 (104.1)
Other comprehensive loss (income) excluding cash flow hedges 198.4 (89.3)
Balances, end of year $ 167.2 $ (31.2)