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Income taxes - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Disclosure of income taxes [Line Items] |  |
Non-capital losses | $ 676,756 | $ 587,407
Deductible temporary differences | 58,737 | 63,695
Research and development |  |
Disclosure of income taxes [Line Items] |  |
Research and development expenditures | 2,598 | 2,598
E-business |  |
Disclosure of income taxes [Line Items] |  |
Research and development expenditures | 5,692 | 4,823
With expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences | 354,039 | 320,344
No expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences | 322,717 | 267,063
Canada |  |
Disclosure of income taxes [Line Items] |  |
Provision for tax refund receivable | $ 3,622 | $ 4,077

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