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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefits – defined benefit plans $ 40.9 $ 32.4
Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 29.0 23.8
Interest expense (income), net defined benefit liability (asset) (15.3) (15.2)
Past service cost, net defined benefit liability (asset) 1.7 0.0
Administrative costs, net defined benefit liability (asset) 1.0 1.4
Post-employment benefits – defined benefit plans 35.0 27.9
Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 29.0 23.8
Interest expense (income), net defined benefit liability (asset) 18.6 17.9
Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.5 2.3
Interest expense (income), net defined benefit liability (asset) 2.4 2.2
Past service cost, net defined benefit liability (asset) 0.0 0.0
Post-employment benefits – defined benefit plans 5.9 4.5
Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.5 2.3
Interest expense (income), net defined benefit liability (asset) 2.4 2.2
Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Interest expense (income), net defined benefit liability (asset)   (1.1)
Post-employment benefits – defined benefit plans 4.1 2.0
Foreign | Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.8 1.5
Interest expense (income), net defined benefit liability (asset) (1.0)  
Past service cost, net defined benefit liability (asset) 0.0 0.0
Administrative costs, net defined benefit liability (asset) 0.1 0.2
Post-employment benefits – defined benefit plans 2.1 1.8
Foreign | Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.8 1.5
Interest expense (income), net defined benefit liability (asset) 1.2 1.2
Foreign | Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.1 0.0
Interest expense (income), net defined benefit liability (asset) 0.2 0.2
Past service cost, net defined benefit liability (asset) 1.7 0.0
Post-employment benefits – defined benefit plans 2.0 0.2
Foreign | Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.1 0.0
Interest expense (income), net defined benefit liability (asset) 0.2 0.2
Canada    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefits – defined benefit plans 36.8 30.4
Canada | Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 27.2 22.3
Interest expense (income), net defined benefit liability (asset) (14.3) (14.1)
Past service cost, net defined benefit liability (asset) 1.7 0.0
Administrative costs, net defined benefit liability (asset) 0.9 1.2
Post-employment benefits – defined benefit plans 32.9 26.1
Canada | Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 27.2 22.3
Interest expense (income), net defined benefit liability (asset) 17.4 16.7
Canada | Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.4 2.3
Interest expense (income), net defined benefit liability (asset) 2.2 2.0
Past service cost, net defined benefit liability (asset) (1.7) 0.0
Post-employment benefits – defined benefit plans 3.9 4.3
Canada | Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.4 2.3
Interest expense (income), net defined benefit liability (asset) $ 2.2 $ 2.0