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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs $ 41.7 $ 42.4
Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 36.4
Interest cost and income (24.1) (16.9)
Past service cost 0.0 (5.9)
Administrative cost 0.6 1.1
Net pension costs 33.1 34.5
Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 36.4
Interest cost and income 24.1 19.8
Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.1 5.2
Interest cost and income 3.3 2.4
Past service cost 0.2 0.3
Net pension costs 8.6 7.9
Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.1 5.2
Interest cost and income 3.3 2.4
Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs 40.2 45.4
Canadian | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 35.0
Interest cost and income (23.9) (16.4)
Past service cost 0.0 0.0
Administrative cost 0.6 1.0
Net pension costs 33.1 38.8
Canadian | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 32.5 35.0
Interest cost and income 23.9 19.2
Canadian | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 4.1 4.4
Interest cost and income 3.0 2.2
Past service cost 0.0 0.0
Net pension costs 7.1 6.6
Canadian | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 4.1 4.4
Interest cost and income 3.0 2.2
Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs 1.5 (3.0)
Foreign | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 1.4
Interest cost and income (0.2) (0.5)
Past service cost 0.0 (5.9)
Administrative cost 0.0 0.1
Net pension costs 0.0 (4.3)
Foreign | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 1.4
Interest cost and income 0.2 0.6
Foreign | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.0 0.8
Interest cost and income 0.3 0.2
Past service cost 0.2 0.3
Net pension costs 1.5 1.3
Foreign | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.0 0.8
Interest cost and income $ 0.3 $ 0.2