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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, 2024
Mar. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   $ 40.8  
Actuarial loss (gain) arising from:      
Net defined benefit liability (asset), end of year   33.0 $ 40.8
Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (51.0)  
Current service cost   31.9 32.5
Interest cost   (25.4) (24.1)
Actuarial loss (gain) arising from:      
Net defined benefit liability (asset), end of year   (65.7) (51.0)
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   590.7 638.7
Current service cost   31.9 32.5
Interest cost   22.8 24.1
Past service cost   2.9 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (3.0) 25.7
Economic assumptions   4.6 (104.6)
Demographic assumptions   (0.1) 2.5
Employee contributions   9.5 9.2
Pension benefits paid   (14.4) (25.7)
Settlements $ (168.9) (168.9) (11.7)
Net transfers   (0.3) 0.0
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   476.3 590.7
Funded plans | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset), beginning of year   (641.7) (623.9)
Interest cost   (25.4) (24.1)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   18.5 (11.0)
Employer contributions   25.2 33.4
Employee contributions   (9.5) (9.2)
Pension benefits paid   14.4 25.7
Settlements $ 163.5 163.5 11.7
Net transfers   0.3 0.0
Administrative costs   (0.8) (0.6)
Foreign currency exchange differences   0.1 0.1
Net defined benefit liability (asset), end of year   (542.0) (641.7)
Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   5.2 5.1
Interest cost   4.4 3.3
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   91.8 94.9
Current service cost   5.2 5.1
Interest cost   4.4 3.3
Past service cost   0.0 0.2
Actuarial loss (gain) arising from:      
Experience adjustments   0.0 4.9
Economic assumptions   1.0 (13.7)
Pension benefits paid   (3.7) (3.5)
Foreign currency exchange differences   0.0 (0.6)
Net defined benefit liability (asset), end of year   98.7 91.8
Canadian | Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   31.9 32.5
Interest cost   (25.1) (23.9)
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   585.5 631.8
Current service cost   31.9 32.5
Interest cost   22.5 23.9
Past service cost   2.9 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (3.0) 25.5
Economic assumptions   4.6 (102.8)
Demographic assumptions   0.0 2.6
Employee contributions   9.5 9.2
Pension benefits paid   (14.0) (25.5)
Settlements   (168.9) (11.7)
Net transfers   (0.3) 0.0
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   471.3 585.5
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   (635.3) (617.1)
Interest cost   (25.1) (23.9)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   18.2 (10.1)
Employer contributions   24.9 33.0
Employee contributions   (9.5) (9.2)
Pension benefits paid   14.0 25.5
Settlements   163.5 11.7
Net transfers   0.3 0.0
Administrative costs   (0.8) (0.6)
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   (535.0) (635.3)
Canadian | Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   3.9 4.1
Interest cost   3.9 3.0
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   81.3 82.6
Current service cost   3.9 4.1
Interest cost   3.9 3.0
Past service cost   0.0 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   (0.4) 5.5
Economic assumptions   0.5 (11.0)
Pension benefits paid   (3.0) (2.9)
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   86.2 81.3
Foreign | Funded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   0.0 0.0
Interest cost   (0.3) (0.2)
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   5.2 6.9
Current service cost   0.0 0.0
Interest cost   0.3 0.2
Past service cost   0.0 0.0
Actuarial loss (gain) arising from:      
Experience adjustments   0.0 0.2
Economic assumptions   0.0 (1.8)
Demographic assumptions   (0.1) (0.1)
Employee contributions   0.0 0.0
Pension benefits paid   (0.4) (0.2)
Settlements   0.0 0.0
Net transfers   0.0 0.0
Foreign currency exchange differences   0.0 0.0
Net defined benefit liability (asset), end of year   5.0 5.2
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   (6.4) (6.8)
Interest cost   (0.3) (0.2)
Actuarial loss (gain) arising from:      
Return on plan assets, excluding amounts included in interest income   0.3 (0.9)
Employer contributions   0.3 0.4
Employee contributions   0.0 0.0
Pension benefits paid   0.4 0.2
Settlements   0.0 0.0
Net transfers   0.0 0.0
Administrative costs   0.0 0.0
Foreign currency exchange differences   0.1 0.1
Net defined benefit liability (asset), end of year   (7.0) (6.4)
Foreign | Unfunded plans      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost   1.3 1.0
Interest cost   0.5 0.3
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   10.5 12.3
Current service cost   1.3 1.0
Interest cost   0.5 0.3
Past service cost   0.0 0.2
Actuarial loss (gain) arising from:      
Experience adjustments   0.4 (0.6)
Economic assumptions   0.5 (2.7)
Pension benefits paid   (0.7) (0.6)
Foreign currency exchange differences   0.0 (0.6)
Net defined benefit liability (asset), end of year   $ 12.5 $ 10.5