SHARE-BASED PAYMENTS - Share-based payment expense (Details) - CAD ($) $ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total share-based payments expense	$ 61.5	$ 34.5
Impact of equity swap agreements (Note 32)	(14.6)	6.6
Amount capitalized	(1.0)	(1.0)
Share-based payments expense, net of equity swap (Note 27)	45.9	40.1
Stock option plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	5.9	7.0
RSU plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	6.6	4.7
PSU plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	12.7	3.6
Stock purchase plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	16.2	15.7
DSU plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	14.9	(1.1)
RSU plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	1.9	2.2
PSU plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	$ 3.3	$ 2.4

Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount1

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Hedging Expense (Recovery), Recognized

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- Definition

Share based payments expense, net of equity swap

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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.

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- Definition

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

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