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DEBT FACILITIES - Retirement Payments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Required payments related to retirement provisions, long-term debt, gross $ 1,117.5 $ 1,084.9
Required payments related to retirement provisions, long-term debt, transaction costs (2.0) (2.8)
Required payments related to retirement provisions, long-term debt, net 1,115.5 1,082.1
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 35.6 31.9
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 450.2 414.8
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 $ 631.7 $ 638.2