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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefits – defined benefit plans $ 43.0 $ 40.9
Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 29.0
Interest expense (income), net defined benefit liability (asset) (15.8) (15.3)
Past service cost, net defined benefit liability (asset) 0.0 1.7
Administrative costs, net defined benefit liability (asset) 1.1 1.0
Post-employment benefits – defined benefit plans 36.9 35.0
Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 29.0
Interest expense (income), net defined benefit liability (asset) 19.1 18.6
Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.9 3.5
Interest expense (income), net defined benefit liability (asset) 2.3 2.4
Past service cost, net defined benefit liability (asset) (0.1) 0.0
Post-employment benefits – defined benefit plans 6.1 5.9
Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.9 3.5
Interest expense (income), net defined benefit liability (asset) 2.3 2.4
Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Interest expense (income), net defined benefit liability (asset)   (1.0)
Post-employment benefits – defined benefit plans 3.2 4.1
Foreign | Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.1 1.8
Interest expense (income), net defined benefit liability (asset) (0.9)  
Past service cost, net defined benefit liability (asset) 0.0 0.0
Administrative costs, net defined benefit liability (asset) 0.2 0.1
Post-employment benefits – defined benefit plans 2.5 2.1
Foreign | Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 2.1 1.8
Interest expense (income), net defined benefit liability (asset) 1.1 1.2
Foreign | Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.6 0.1
Interest expense (income), net defined benefit liability (asset) 0.2 0.2
Past service cost, net defined benefit liability (asset) (0.1) 1.7
Post-employment benefits – defined benefit plans 0.7 2.0
Foreign | Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.6 0.1
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 39.8 36.8
Canada | Funded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 30.4 27.2
Interest expense (income), net defined benefit liability (asset) (14.9) (14.3)
Past service cost, net defined benefit liability (asset) 0.0 1.7
Administrative costs, net defined benefit liability (asset) 0.9 0.9
Post-employment benefits – defined benefit plans 34.4 32.9
Canada | Funded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 30.4 27.2
Interest expense (income), net defined benefit liability (asset) 18.0 17.4
Canada | Unfunded    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.3 3.4
Interest expense (income), net defined benefit liability (asset) 2.1 2.2
Past service cost, net defined benefit liability (asset) 0.0 (1.7)
Post-employment benefits – defined benefit plans 5.4 3.9
Canada | Unfunded | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.3 3.4
Interest expense (income), net defined benefit liability (asset) $ 2.1 $ 2.2