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Share capital - New Issue and Secondary Offering (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 13, 2021
Feb. 12, 2021
Sep. 15, 2020
Mar. 31, 2022
Mar. 31, 2021
Disclosure of classes of share capital [table]          
Issuance of shares upon public offerings       $ 823,515 $ 952,534
Share issuance costs       $ 33,984 $ 44,702
Subordinate voting shares          
Disclosure of classes of share capital [table]          
Issuance of shares upon public offerings $ 823,515        
Share issuance costs $ 33,042   $ 18,044    
Marketed public offering | Subordinate voting shares          
Disclosure of classes of share capital [table]          
Number of common shares issued, bought deal offering   9,660,000      
Issuance of shares upon public offerings (in shares)   8,860,000      
Issuance of shares upon public offerings   $ 620,200      
Share issuance costs   $ 26,202      
Marketed public offering, over-allotment option | Subordinate voting shares          
Disclosure of classes of share capital [table]          
Number of common shares issued, bought deal offering   1,260,000      
Marketed public offering, secondary sale | Subordinate voting shares          
Disclosure of classes of share capital [table]          
Issuance of shares upon public offerings (in shares)   800,000      
Proceeds from issue of ordinary shares   $ 56,000