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EMPLOYEE BENEFITS OBLIGATIONS - Movement In Defined Benefit Pension Obligation (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2025
Mar. 31, 2024
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   $ 33.0  
Actuarial loss (gain) arising from:      
Net defined benefit liability (asset), end of year   122.5 $ 33.0
Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (65.7)  
Current service cost   32.9 31.9
Interest cost   (26.4) (25.4)
Actuarial loss (gain) arising from:      
Net defined benefit liability (asset), end of year   13.3 (65.7)
Funded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   476.3 590.7
Current service cost   32.9 31.9
Interest cost   22.7 22.8
Past service cost   0.0 2.9
Actuarial loss (gain) arising from:      
Experience adjustments   43.4 (3.0)
Economic assumptions   23.2 4.6
Demographic assumptions   0.0 (0.1)
Employee contributions   12.9 9.5
Pension benefits paid   (12.6) (14.4)
Settlements $ (168.9) 0.0 (168.9)
Net transfers   0.0 (0.3)
Foreign currency exchange differences   (0.4) 0.0
Net defined benefit liability (asset), end of year   599.2 476.3
Funded plans | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (542.0) (641.7)
Interest cost   (26.4) (25.4)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   14.2 18.5
Employer contributions   1.8 25.2
Employee contributions   (12.9) (9.5)
Pension benefits paid   12.6 14.4
Settlements $ 163.5 (1.4) 163.5
Net transfers   0.0 0.3
Administrative costs   (0.8) (0.8)
Foreign currency exchange differences   0.6 0.1
Net defined benefit liability (asset), end of year   (585.9) (542.0)
Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   4.8 5.2
Interest cost   4.4 4.4
Unfunded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   98.7 91.8
Current service cost   4.8 5.2
Interest cost   4.4 4.4
Past service cost   2.4 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (1.2) 0.0
Economic assumptions   3.1 1.0
Pension benefits paid   (3.8) (3.7)
Foreign currency exchange differences   (0.8) 0.0
Net defined benefit liability (asset), end of year   109.2 98.7
Canadian | Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   32.9 31.9
Interest cost   (26.0) (25.1)
Canadian | Funded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   471.3 585.5
Current service cost   32.9 31.9
Interest cost   22.4 22.5
Past service cost   0.0 2.9
Actuarial loss (gain) arising from:      
Experience adjustments   43.3 (3.0)
Economic assumptions   23.3 4.6
Demographic assumptions   0.0 0.0
Employee contributions   12.9 9.5
Pension benefits paid   (12.3) (14.0)
Settlements   0.0 (168.9)
Net transfers   0.0 (0.3)
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   593.8 471.3
Canadian | Funded plans | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (535.0) (635.3)
Interest cost   (26.0) (25.1)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   14.3 18.2
Employer contributions   1.8 24.9
Employee contributions   (12.9) (9.5)
Pension benefits paid   12.3 14.0
Settlements   (1.4) 163.5
Net transfers   0.0 0.3
Administrative costs   (0.8) (0.8)
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   (578.3) (535.0)
Canadian | Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   4.1 3.9
Interest cost   4.0 3.9
Canadian | Unfunded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   86.2 81.3
Current service cost   4.1 3.9
Interest cost   4.0 3.9
Past service cost   3.6 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (0.2) (0.4)
Economic assumptions   2.8 0.5
Pension benefits paid   (3.1) (3.0)
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   97.4 86.2
Foreign | Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   0.0 0.0
Interest cost   (0.4) (0.3)
Foreign | Funded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   5.0 5.2
Current service cost   0.0 0.0
Interest cost   0.3 0.3
Past service cost   0.0 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   0.1 0.0
Economic assumptions   (0.1) 0.0
Demographic assumptions   0.0 (0.1)
Employee contributions   0.0 0.0
Pension benefits paid   (0.3) (0.4)
Settlements   0.0 0.0
Net transfers   0.0 0.0
Foreign currency exchange differences   (0.4) 0.0
Net defined benefit liability (asset), end of year   5.4 5.0
Foreign | Funded plans | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (7.0) (6.4)
Interest cost   (0.4) (0.3)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   (0.1) 0.3
Employer contributions   0.0 0.3
Employee contributions   0.0 0.0
Pension benefits paid   0.3 0.4
Settlements   0.0 0.0
Net transfers   0.0 0.0
Administrative costs   0.0 0.0
Foreign currency exchange differences   0.6 0.1
Net defined benefit liability (asset), end of year   (7.6) (7.0)
Foreign | Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   0.7 1.3
Interest cost   0.4 0.5
Foreign | Unfunded plans | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   12.5 10.5
Current service cost   0.7 1.3
Interest cost   0.4 0.5
Past service cost   (1.2) 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (1.0) 0.4
Economic assumptions   0.3 0.5
Pension benefits paid   (0.7) (0.7)
Foreign currency exchange differences   (0.8) 0.0
Net defined benefit liability (asset), end of year   $ 11.8 $ 12.5