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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year $ 2,410.0 $ 2,297.5
Other comprehensive income (loss) 7.2 (55.3)
Balances, end of year 2,578.3 [1] 2,410.0
Foreign currency translation    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 208.9 266.6
Other comprehensive income (loss) 17.0 (57.7)
Balances, end of year 225.9 208.9
Net change in cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year (10.5) (6.9)
Other comprehensive income (loss) (22.8) (3.6)
Balances, end of year (33.3) (10.5)
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 income (loss) 0.0 0.0
Balances, end of year 0.6 0.6
Accumulated other comprehensive income    
Disclosure of analysis of other comprehensive income by item [line items]    
Balances, beginning of year 199.0 260.3
Other comprehensive income (loss) (5.8) (61.3)
Balances, end of year $ 193.2 $ 199.0
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.