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Income taxes - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Disclosure of income taxes [Line Items]    
Non-capital losses $ 676,756 $ 587,407
Deductible temporary differences 58,737 63,695
Research and development    
Disclosure of income taxes [Line Items]    
Research and development expenditures 2,598 2,598
E-business    
Disclosure of income taxes [Line Items]    
Research and development expenditures 5,692 4,823
With expiry    
Disclosure of income taxes [Line Items]    
Deductible temporary differences 354,039 320,344
No expiry    
Disclosure of income taxes [Line Items]    
Deductible temporary differences 322,717 267,063
Canada    
Disclosure of income taxes [Line Items]    
Provision for tax refund receivable $ 3,622 $ 4,077