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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 394,067 | $ 253,813
Non-capital loss carryforwards | 721,289 | 421,002
Previously stated |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised |  | 218,801
With expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 226,403 | 185,666
With expiry | Previously stated |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised |  | 177,381
No expiry |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 167,664 | 68,147
No expiry | Previously stated |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised |  | 41,420
Research and development |  |
Disclosure of income taxes [Line Items] |  |
Unused tax credits for which no deferred tax asset recognised | 2,548 | 2,230
E-business |  |
Disclosure of income taxes [Line Items] |  |
Unused tax credits for which no deferred tax asset recognised | 3,772 | 2,857
Canada |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 60,237 | 46,412
Research and development expense, available for reduction of future taxable income | 15,456 | 13,508
Non-capital loss carryforwards | 151,096 | 73,737
Provision for tax refund receivable | 3,933 | 3,146
Canada | Previously stated |  |
Disclosure of income taxes [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised |  | 13,272
Non-capital loss carryforwards |  | 65,452
United States |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | $ 366,680 | 236,149
United States | Previously stated |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards |  | $ 209,422

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