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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs $ 42.4 $ 40.4
Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 36.4 30.8
Interest cost and income (16.9) (17.9)
Past service cost (5.9) (1.8)
Administrative cost 1.1 1.1
Net pension costs 34.5 33.8
Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 36.4 30.8
Interest cost and income 19.8 21.6
Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.2 3.8
Interest cost and income 2.4 2.8
Past service cost 0.3 0.0
Net pension costs 7.9 6.6
Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.2 3.8
Interest cost and income 2.4 2.8
Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs 45.4 39.7
Canadian | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 35.0 28.4
Interest cost and income (16.4) (16.9)
Past service cost 0.0 1.0
Administrative cost 1.0 0.9
Net pension costs 38.8 33.9
Canadian | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 35.0 28.4
Interest cost and income 19.2 20.5
Canadian | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 4.4 3.2
Interest cost and income 2.2 2.6
Past service cost 0.0 0.0
Net pension costs 6.6 5.8
Canadian | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 4.4 3.2
Interest cost and income 2.2 2.6
Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs (3.0) 0.7
Foreign | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.4 2.4
Interest cost and income (0.5) (1.0)
Past service cost (5.9) (2.8)
Administrative cost 0.1 0.2
Net pension costs (4.3) (0.1)
Foreign | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.4 2.4
Interest cost and income 0.6 1.1
Foreign | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.8 0.6
Interest cost and income 0.2 0.2
Past service cost 0.3 0.0
Net pension costs 1.3 0.8
Foreign | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.8 0.6
Interest cost and income $ 0.2 $ 0.2