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EMPLOYEE BENEFITS OBLIGATIONS - Employee Benefit Obligation (Details) - CAD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Disclosure of defined benefit plans [line items]
Employee benefits obligations	$ 109.7	$ 222.2
Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations	14.8	119.6
Funded and unfunded defined benefit pension obligations | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations	638.7	761.5	$ 649.2
Funded and unfunded defined benefit pension obligations | Unfunded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations	94.9	102.6	93.7
Fair value of plan assets | Funded plans
Disclosure of defined benefit plans [line items]
Employee benefits obligations	$ (623.9)	$ (641.9)	$ (530.1)

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 140
-Subparagraph a
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-URIDate 2021-03-24

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