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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Fair value measurements (Details) - CAD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ (6,823) $ 600
Financial assets, at fair value (6,823) 600
Derivatives | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (6,823) 600
Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (12,255)  
Financial assets, at fair value (12,255)  
Derivatives | Cash flow hedges | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (12,255)  
Derivatives | Hedges of net investment in foreign operations | Cross-currency interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (6,192) 3,103
Financial assets, at fair value (6,192) 3,103
Derivatives | Hedges of net investment in foreign operations | Cross-currency interest rate swap instrument | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (6,192) 3,103
Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (6,534) 1,198
Financial assets, at fair value (6,534) 1,198
Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets (6,534) 1,198
Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   2,290
Financial liabilities, at fair value   2,290
Derivatives | Cash flow hedges | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   2,290
Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (1,543,678) (1,171,972)
Financial liabilities, at fair value (1,505,614) (1,130,183)
Long-term debt | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (1,543,678) (1,171,972)
Level 1 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 1 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0  
Level 1 | Derivatives | Hedges of net investment in foreign operations | Cross-currency interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 1 | Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 1 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value   0
Level 1 | Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Level 2 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value (6,823) 600
Level 2 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value (12,255)  
Level 2 | Derivatives | Hedges of net investment in foreign operations | Cross-currency interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value (6,192) 3,103
Level 2 | Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value (6,534) 1,198
Level 2 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value   2,290
Level 2 | Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (1,505,614) (1,130,183)
Level 3 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 3 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0  
Level 3 | Derivatives | Hedges of net investment in foreign operations | Cross-currency interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 3 | Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Level 3 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value   0
Level 3 | Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value $ 0 $ 0