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BALANCE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue that was included in contract liability balance	$ 740.0	$ 712.6
(Reversal of) revenue from performance obligations satisfied or partially satisfied in previous periods	(45.7)	$ 86.6
Remaining performance obligations	$ 8,529.5
No later than 1 year
Disclosure of disaggregation of revenue from contracts with customers [line items]
Performance obligations recognition expectation (in percent)	33.00%
Later than one year
Disclosure of disaggregation of revenue from contracts with customers [line items]
Performance obligations recognition expectation (in percent)	20.00%

X

- Definition

Increase (Decrease) In Revenue From Performance Obligations Satisfied Or Partially Satisfied In Previous Periods

+ References

No definition available.

+ Details

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- Definition

Revenue, Remaining Performance Obligation, Percentage

+ References

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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 revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 116
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2024-03-27

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- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 120
-Subparagraph a
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-URIDate 2024-03-27

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