Debt - Summary of Components of Debt (Details) - CAD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Other revolving debt facility, loan, and financings	$ 465	$ 1,143
Senior Notes	350,355	469,818
Less: current portion	(3,167)	(103,935)
Long-term portion	438,404	493,294
Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	360,481	486,935
Accrued interest	284	831
Deferred financing costs	(10,410)	(17,948)
Credit facility	$ 441,571	597,229
Maturity date	Dec. 18, 2026
Supreme Convertible Debentures
Debt Instrument [Line Items]
Convertible debentures	$ 2,267	30,654
Maturity date	Sep. 10, 2025
May 2024 Convertible Debenture
Debt Instrument [Line Items]
Convertible debentures	$ 88,067
Maturity date	May 14, 2029
Accretion Debentures
Debt Instrument [Line Items]
Accretion debentures	$ 417	6,390
Maturity date	Sep. 10, 2025
Promissory Note
Debt Instrument [Line Items]
Promissory note		$ 89,224
Maturity date	Dec. 31, 2024

Accretion debentures.

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Convertible debentures.

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Credit facility

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Promissory note.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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Amount of long-term debt classified as other.

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