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Segmented Information - Schedule of non-current tangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Mar. 31, 2024
Disclosure of operating segments [line items]    
Plant and equipment $ 115,220 $ 95,356
ROU asset 7,570 8,488
Non-current tangible assets 122,790 103,844
Canada [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 83,654 74,425
ROU asset 3,351 3,352
Non-current tangible assets 87,005 77,777
Sweden [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 30,828 19,529
ROU asset 4,159 5,051
Non-current tangible assets 34,987 24,580
Iceland [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 492 1,367
ROU asset 0 0
Non-current tangible assets 492 1,367
Switzerland [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 0 0
ROU asset 0 0
Non-current tangible assets 0 0
Paraguay [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 232 0
ROU asset 0 0
Non-current tangible assets 232 0
Bermuda [Member]    
Disclosure of operating segments [line items]    
Plant and equipment 14 35
ROU asset 60 85
Non-current tangible assets $ 74 $ 120