SHARE-BASED PAYMENTS - Share-based payment expense (Details) - CAD ($) $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total share-based payments expense	$ 34.5	$ 28.5
Impact of equity swap agreements (Note 30)	6.6	5.3
Amount capitalized	(1.0)	(0.9)
Share-based payments expense, net of equity swap (Note 25)	40.1	32.9
Stock option plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	7.0	6.1
Equity-settled RSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	4.7	0.0
Equity-settled PSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plans	3.6	0.0
Cash-settled RSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	2.2	6.6
Cash-settled PSU
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	2.4	0.4
Stock purchase plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	15.7	12.8
DSU plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	$ (1.1)	$ 2.6

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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- 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.

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No definition available.

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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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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

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