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Share capital (Details)
12 Months Ended
Mar. 31, 2022
vote
shares
Mar. 31, 2021
shares
Mar. 31, 2020
shares
Disclosure of classes of share capital [table]      
Issued common shares (in shares) 148,661,312 128,528,515  
Subordinate voting shares      
Disclosure of classes of share capital [table]      
Votes per share (in votes per share) | vote 1    
Issued and Outstanding Shares      
Disclosure of classes of share capital [table]      
Issued common shares (in shares) 148,661,312 128,528,515  
Outstanding common shares (in shares) 148,661,312 128,528,515 92,206,817