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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Credit risk (Details) - Trade accounts receivable - Credit risk - CAD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Total $ 705,255 $ 443,570
Current    
Disclosure of detailed information about financial instruments [line items]    
Total 594,154 316,492
1 – 30 days    
Disclosure of detailed information about financial instruments [line items]    
Total 31,548 68,454
31 – 60 days    
Disclosure of detailed information about financial instruments [line items]    
Total 18,521 12,537
61 – 90 days    
Disclosure of detailed information about financial instruments [line items]    
Total 8,141 13,554
Over 90 days    
Disclosure of detailed information about financial instruments [line items]    
Total $ 52,891 $ 32,533