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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