SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total share-based payments expense	$ 28.5	$ 31.0
Impact of equity swap agreements (Note 29)	5.3	9.2
Amount capitalized	(0.9)	(0.5)
Share-based payments expense, net of equity swap (Note 24)	32.9	39.7
Total carrying amount of share-based payments liabilities	74.5	89.8
Current portion	11.3	19.8
Non-current portion (Note 20)	63.2	70.0
Stock option plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Equity-settled plan	6.1	7.8
Stock purchase plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	12.8	11.6
Deferred share unit (DSU) plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	3.3	1.1
Cash-settled plans	21.3	20.6
Restricted share unit (RSU) plans
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	5.9	1.3
Cash-settled plans	40.5	42.4
Performance share unit (PSU) plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Cash-settled plans	0.4	9.2
Cash-settled plans	$ 12.7	$ 26.8

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Current portion of carrying amount of share-based payment liabilities

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

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Liabilities From Share-based Compensation Obligation

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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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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]

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

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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]]

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