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EMPLOYEE BENEFITS OBLIGATIONS - Employee Benefit Obligation (Details) - CAD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	$ 40.8	$ 109.7
Employee benefit assets	(51.1)	0.0
Employee benefit obligations	91.9	109.7
Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	(51.0)	14.8
Funded and unfunded defined benefit pension obligations | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	590.7	638.7	$ 761.5
Funded and unfunded defined benefit pension obligations | Unfunded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	91.8	94.9	102.6
Fair value of plan assets | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations - net	$ (641.7)	$ (623.9)	$ (641.9)

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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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