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DEBT FACILITIES - Retirement Payments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of finance lease and operating lease by lessee [line items]    
Required payments related to retirement provisions, long-term debt, gross $ 2,076.1 $ 1,117.5
Required payments related to retirement provisions, long-term debt, transaction costs (7.1) (2.0)
Required payments related to retirement provisions, long-term debt, net 2,069.0 1,115.5
No later than 1 year    
Disclosure of finance lease and operating lease by lessee [line items]    
Required payments related to retirement provisions, long-term debt, gross 202.0 35.6
Later than 1 year and no later than 5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Required payments related to retirement provisions, long-term debt, gross 414.0 450.2
Later than 5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Required payments related to retirement provisions, long-term debt, gross $ 1,460.1 $ 631.7