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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Categories of financial instruments (Details) - CAD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Bank indebtedness
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	$ (27,271)	$ (4,060)
Bank indebtedness | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Bank indebtedness | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(27,271)	(4,060)
Bank indebtedness | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Trade accounts payable and accrued liabilities
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(543,978)	(535,844)
Trade accounts payable and accrued liabilities | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Trade accounts payable and accrued liabilities | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(543,978)	(535,844)
Trade accounts payable and accrued liabilities | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Long-term debt
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(1,543,678)	(1,171,972)
Long-term debt | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Long-term debt | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(1,543,678)	(1,171,972)
Long-term debt | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
Derivatives | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		2,290
Derivatives | Fair value through profit or loss | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		0
Derivatives | Amortized cost | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		0
Derivatives | Fair value through other comprehensive income | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		2,290
Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	225,947	170,177
Cash and cash equivalents | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Cash and cash equivalents | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial assets	225,947	170,177
Cash and cash equivalents | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Trade accounts receivable
Disclosure of detailed information about financial instruments [line items]
Financial assets	696,079	437,329
Trade accounts receivable | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Trade accounts receivable | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial assets	696,079	437,329
Trade accounts receivable | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets	(6,823)	600
Derivatives | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial assets	(12,255)
Derivatives | Cross-currency interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	(6,192)	3,103
Derivatives | Interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	(6,534)	1,198
Derivatives | Fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Financial assets	(6,823)	600
Derivatives | Fair value through profit or loss | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial assets	0
Derivatives | Fair value through profit or loss | Cross-currency interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Fair value through profit or loss | Interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Amortized cost | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial assets	0
Derivatives | Amortized cost | Cross-currency interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Amortized cost | Interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Fair value through other comprehensive income
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
Derivatives | Fair value through other comprehensive income | Cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Financial assets	(12,255)
Derivatives | Fair value through other comprehensive income | Cross-currency interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	(6,192)	3,103
Derivatives | Fair value through other comprehensive income | Interest rate swap instrument | Hedges of net investment in foreign operations
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ (6,534)	$ 1,198

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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