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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences | $ 63,695 | $ 60,237
Research and development expense, available for reduction of future taxable income | 21,760 | 15,456
With expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences | 320,344 | 226,403
No expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences | 267,063 | 167,664
Research and development |  |
Disclosure of income taxes [Line Items] |  |
Research and development expenditures | 2,598 | 2,548
E-business |  |
Disclosure of income taxes [Line Items] |  |
Research and development expenditures | 4,823 | 3,772
Canada |  |
Disclosure of income taxes [Line Items] |  |
Provision for tax refund receivable | $ 4,077 | $ 3,933

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