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EMPLOYEE BENEFITS OBLIGATIONS - Employee Benefit Obligation (Details) - CAD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disclosure of defined benefit plans [line items]
Employee benefits obligations	$ 222.2	$ 212.8
Funded
Disclosure of defined benefit plans [line items]
Employee benefits obligations	119.6	119.1
Present value of defined benefit obligation | Funded
Disclosure of defined benefit plans [line items]
Employee benefits obligations	761.5	649.2	$ 664.4
Present value of defined benefit obligation | Unfunded
Disclosure of defined benefit plans [line items]
Employee benefits obligations	102.6	93.7	91.9
Plan assets | Funded
Disclosure of defined benefit plans [line items]
Employee benefits obligations	$ (641.9)	$ (530.1)	$ (543.7)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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 2020-01-01
-Paragraph 140
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard
-URIDate 2020-01-01

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