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EMPLOYEE BENEFITS OBLIGATIONS - Employee Benefit Obligation (Details) - CAD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	$ (33.0)	$ (40.8)
Employee benefit assets	(65.7)	(51.1)
Employee benefit obligations	98.7	91.9
Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	65.7	51.0
Funded and unfunded defined benefit pension obligations | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	(476.3)	(590.7)	$ (638.7)
Funded and unfunded defined benefit pension obligations | Unfunded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	(98.7)	(91.8)	(94.9)
Fair value of plan assets | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	$ 542.0	$ 641.7	$ 623.9

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [member]]

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