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COMMITMENTS AND CONTINGENCIES (Details) - CAD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Disclosure of contingent liabilities [line items]    
Purchase obligations $ 403,883  
Letters of credit 279,383 $ 171,065
Less than one year    
Disclosure of contingent liabilities [line items]    
Purchase obligations 385,207  
One - two years    
Disclosure of contingent liabilities [line items]    
Purchase obligations 13,328  
Two - three years    
Disclosure of contingent liabilities [line items]    
Purchase obligations 2,214  
Three - four years    
Disclosure of contingent liabilities [line items]    
Purchase obligations 1,548  
Four - five years    
Disclosure of contingent liabilities [line items]    
Purchase obligations 1,046  
Due in over five years    
Disclosure of contingent liabilities [line items]    
Purchase obligations $ 540