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Income taxes - Non-Capital Loss Carryforwards (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | ---
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | $ 721,289 | $ 421,002
Canada |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 151,096 | 73,737
Belgium |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 41,928 | 40,383
Netherlands |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 38,213 | 31,105
United States |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 366,680 | 236,149
Germany |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 21,289 | 21,219
Switzerland |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 36,139 | 13,042
New Zealand |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 57,366 | 0
United Kingdom |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | 9 | 0
Australia |  |
Disclosure of income taxes [Line Items] |  |
Non-capital loss carryforwards | $ 8,569 | $ 5,367

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