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DEBT FACILITIES - Long-term Debt (Details)
Mar. 31, 2023
CAD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current $ 214,600,000   $ 241,800,000
Non-current 3,035,500,000   2,804,400,000
U.S. dollar, fixed rate - 3.60% to 4.90%      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 947,000,000.0  
Current 18,500,000   17,400,000
Non-current $ 1,257,900,000   1,176,500,000
U.S. dollar, fixed rate - 3.60% to 4.90% | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 3.60% 3.60%  
U.S. dollar, fixed rate - 3.60% to 4.90% | Top of range      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 4.90% 4.90%  
Canadian dollar, fixed rate - 4.15%      
Disclosure of detailed information about borrowings [line items]      
Interest rate (in percent) 4.15% 4.15%  
Notional amount $ 24,300,000    
Current 2,900,000   2,900,000
Non-current 21,400,000   24,200,000
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 350,000,000.0  
Current 67,000,000.0   69,700,000
Non-current 405,400,000   443,100,000
Canadian dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Notional amount 29,600,000    
Current 5,600,000   5,600,000
Non-current 23,800,000   29,400,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 15,200,000   14,100,000
Non-current 47,400,000   58,400,000
U.S. dollar      
Disclosure of detailed information about borrowings [line items]      
Current 55,700,000   66,100,000
Non-current 241,300,000   164,600,000
Other      
Disclosure of detailed information about borrowings [line items]      
Current 25,500,000   32,900,000
Non-current 133,400,000   131,400,000
Canadian dollar      
Disclosure of detailed information about borrowings [line items]      
Current 24,200,000   33,100,000
Non-current 471,900,000   439,900,000
U.S. dollar, variable rate      
Disclosure of detailed information about borrowings [line items]      
Current 0   0
Non-current $ 433,000,000.0   $ 336,900,000