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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year $ 2,578.3 $ 2,382.5
Other comprehensive (loss) income (140.1) 7.2
Balances, end of year 3,212.8 2,578.3
Foreign currency translation    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 225.9 208.9
Other comprehensive (loss) income (161.4) 17.0
Balances, end of year 64.5 225.9
Net change in cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (33.3) (10.5)
Other comprehensive (loss) income 28.1 (22.8)
Balances, end of year (5.2) (33.3)
Net changes in available-for-sale financial instruments    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 0.6 0.6
Other comprehensive (loss) income (1.8) 0.0
Balances, end of year (1.2) 0.6
Accumulated other comprehensive income    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 193.2 199.0
Other comprehensive (loss) income (135.1) (5.8)
Balances, end of year $ 58.1 $ 193.2