v3.25.2
Assets Held for Sale and Discontinued Operations - Assets Held For Sale (Details)
$ in Thousands, € in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
CAD ($)
Mar. 31, 2024
EUR (€)
Disclosure Of Non-current Assets Held For Sale [Line Items]        
Beginning balance $ 1,399   $ 638  
Additions 14,089   10,918  
Impairment (11,643)   (585)  
Foreign exchange 57   (1)  
Proceeds from disposal (2,399)   (11,203)  
Gain on disposal     1,632  
Assignment of liabilities held for sale (1,281)      
Ending balance 222   1,399  
Whistler Alpha Lake        
Disclosure Of Non-current Assets Held For Sale [Line Items]        
Beginning balance 0   638  
Additions 0   0  
Impairment 0   0  
Foreign exchange 0   0  
Proceeds from disposal 0   (2,270)  
Gain on disposal     1,632  
Assignment of liabilities held for sale 0      
Ending balance 0   0  
European R&D Facility & Land        
Disclosure Of Non-current Assets Held For Sale [Line Items]        
Beginning balance 0   0  
Additions 0   8,919  
Impairment 0   (600) € (0.4)
Foreign exchange 0   (1)  
Proceeds from disposal 0   (8,333) € (5.8)
Gain on disposal     0  
Assignment of liabilities held for sale 0      
Ending balance 0   0  
Equipment        
Disclosure Of Non-current Assets Held For Sale [Line Items]        
Beginning balance 1,200   0  
Additions 0   1,800  
Impairment 0   0  
Foreign exchange 0   0  
Proceeds from disposal (1,200)   (600)  
Gain on disposal     0  
Assignment of liabilities held for sale 0      
Ending balance 0   1,200  
ICC        
Disclosure Of Non-current Assets Held For Sale [Line Items]        
Beginning balance 199   0  
Additions 14,089   199  
Impairment (11,643)   0  
Foreign exchange 57   0  
Proceeds from disposal (1,200) $ (0.9) 0  
Gain on disposal     0  
Assignment of liabilities held for sale (1,281)      
Ending balance $ 222   $ 199