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Income taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of income taxes [Line Items]    
Deductible temporary differences $ 63,695 $ 60,237
Research and development expense, available for reduction of future taxable income 21,760 15,456
With expiry    
Disclosure of income taxes [Line Items]    
Deductible temporary differences 320,344 226,403
No expiry    
Disclosure of income taxes [Line Items]    
Deductible temporary differences 267,063 167,664
Research and development    
Disclosure of income taxes [Line Items]    
Research and development expenditures 2,598 2,548
E-business    
Disclosure of income taxes [Line Items]    
Research and development expenditures 4,823 3,772
Canada    
Disclosure of income taxes [Line Items]    
Provision for tax refund receivable $ 4,077 $ 3,933