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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs $ 37.2 $ 41.7
Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 31.9 32.5
Interest cost and income (25.4) (24.1)
Past service cost 2.9 0.0
Settlement gain (5.4) 0.0
Administrative cost 0.8 0.6
Net pension costs 27.6 33.1
Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 31.9 32.5
Interest cost and income 22.8 24.1
Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.2 5.1
Interest cost and income 4.4 3.3
Past service cost 0.0 0.2
Net pension costs 9.6 8.6
Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 5.2 5.1
Interest cost and income 4.4 3.3
Canadian    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs 35.4 40.2
Canadian | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 31.9 32.5
Interest cost and income (25.1) (23.9)
Past service cost 2.9 0.0
Settlement gain (5.4) 0.0
Administrative cost 0.8 0.6
Net pension costs 27.6 33.1
Canadian | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 31.9 32.5
Interest cost and income 22.5 23.9
Canadian | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.9 4.1
Interest cost and income 3.9 3.0
Past service cost 0.0 0.0
Net pension costs 7.8 7.1
Canadian | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 3.9 4.1
Interest cost and income 3.9 3.0
Foreign    
Disclosure of net defined benefit liability (asset) [line items]    
Net pension costs 1.8 1.5
Foreign | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 0.0
Interest cost and income (0.3) (0.2)
Past service cost 0.0 0.0
Settlement gain 0.0 0.0
Administrative cost 0.0 0.0
Net pension costs 0.0 0.0
Foreign | Funded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.0 0.0
Interest cost and income 0.3 0.2
Foreign | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.3 1.0
Interest cost and income 0.5 0.3
Past service cost 0.0 0.2
Net pension costs 1.8 1.5
Foreign | Unfunded plans | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 1.3 1.0
Interest cost and income $ 0.5 $ 0.3