SHARE-BASED PAYMENTS - Carrying Amount of Share Based Payment Liabilities (Details) - CAD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total carrying amount of share-based payments liabilities	$ 61.2	$ 74.5
Current portion	9.9	11.3
Share-based payments liabilities (Note 24)	51.3	63.2
DSU plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	41.6	48.4
Cash-settled RSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	9.1	13.4
Cash-settled PSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	$ 10.5	$ 12.7

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 51
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_51_b_i&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant