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Financial instruments - Narrative (Details)
$ in Thousands, $ in Thousands
Mar. 31, 2023
USD ($)
CAD ($)
Mar. 31, 2022
USD ($)
CAD ($)
Mar. 31, 2021
USD ($)
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 800,154 $ 953,654 $ 807,150
Nominal amount of hedging instrument 109,200 26,000  
Equity price risk      
Disclosure of detailed information about financial instruments [line items]      
10% change in the ordinary share price of the company, impact on accrual for social costs $ 288