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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefits – defined benefit plans $ 32.4 $ 31.9
Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefits – defined benefit plans 30.4 30.1
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 2.0 1.8
Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 23.8 23.2
Interest expense (income), net defined benefit liability (asset) (15.2) (14.7)
Administrative costs, net defined benefit liability (asset) 1.4 1.2
Post-employment benefits – defined benefit plans 27.9 27.5
Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 23.8 23.2
Interest expense (income), net defined benefit liability (asset) 17.9 17.8
Funded | Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 22.3 22.0
Interest expense (income), net defined benefit liability (asset) (14.1) (13.6)
Administrative costs, net defined benefit liability (asset) 1.2 1.1
Post-employment benefits – defined benefit plans 26.1 26.0
Funded | Canadian | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 22.3 22.0
Interest expense (income), net defined benefit liability (asset) 16.7 16.5
Funded | Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.5 1.2
Interest expense (income), net defined benefit liability (asset) (1.1)  
Administrative costs, net defined benefit liability (asset) 0.2 0.1
Post-employment benefits – defined benefit plans 1.8 1.5
Funded | Foreign | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.5 1.2
Interest expense (income), net defined benefit liability (asset) 1.2 1.3
Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.3 2.2
Interest expense (income), net defined benefit liability (asset) 2.2 2.1
Past service cost, net defined benefit liability (asset) 0.0 0.1
Post-employment benefits – defined benefit plans 4.5 4.4
Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.3 2.2
Interest expense (income), net defined benefit liability (asset) 2.2 2.1
Unfunded | Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.3 2.2
Interest expense (income), net defined benefit liability (asset) 2.0 1.9
Past service cost, net defined benefit liability (asset) 0.0 0.0
Post-employment benefits – defined benefit plans 4.3 4.1
Unfunded | Canadian | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.3 2.2
Interest expense (income), net defined benefit liability (asset) 2.0 1.9
Unfunded | Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 0.0
Interest expense (income), net defined benefit liability (asset) 0.2 0.2
Past service cost, net defined benefit liability (asset) 0.0 0.1
Post-employment benefits – defined benefit plans 0.2 0.3
Unfunded | Foreign | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 0.0
Interest expense (income), net defined benefit liability (asset) $ 0.2 $ 0.2