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Income taxes - Unrecognized tax assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure Of Income Tax [Abstract]    
Deductible temporary differences $ 63,695 $ 60,237
Non-capital losses 587,407 394,067
Research and development expense, available for reduction of future taxable income 21,760 15,456
Unrecognized tax assets $ 672,862 $ 469,760