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Income taxes - Unrecognized tax assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Income Tax [Abstract]    
Deductible temporary differences $ 58,737 $ 63,695
Non-capital losses 676,756 587,407
Research and development expenditures 12,207 21,760
Unrecognized tax assets $ 747,700 $ 672,862