Income taxes - Narrative (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of income taxes [Line Items] | ||
| Net deferred tax assets | $ 5,009 | $ 0 |
| Non-capital losses | 806,279 | 699,586 |
| Deductible temporary differences | 295,800 | 200,408 |
| Research and development | ||
| Disclosure of income taxes [Line Items] | ||
| Research and development expenditures | 424 | 2,598 |
| E-business | ||
| Disclosure of income taxes [Line Items] | ||
| Research and development expenditures | 2,604 | 3,734 |
| With expiry | ||
| Disclosure of income taxes [Line Items] | ||
| Deductible temporary differences | 456,027 | 371,223 |
| No expiry | ||
| Disclosure of income taxes [Line Items] | ||
| Deductible temporary differences | 350,252 | 328,363 |
| Canada | ||
| Disclosure of income taxes [Line Items] | ||
| Provision for tax refund receivable | 3,300 | 3,344 |
| Canada | Non-refundable tax credit | ||
| Disclosure of income taxes [Line Items] | ||
| E-business tax credit recognized | $ 4,600 | $ 2,795 |