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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Fair value measurements (Details) - CAD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Financial assets $ 600 $ 1,024
Financial assets, at fair value 600 1,024
Derivatives | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 600 1,024
Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,290  
Financial assets, at fair value 2,290  
Derivatives | Cash flow hedges | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 2,290  
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 3,103 5,469
Financial assets, at fair value 3,103 5,469
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 3,103 5,469
Derivatives | Hedges of net investment in foreign operations | Interest rate swap instrument    
Disclosure of detailed information about financial instruments [line items]    
Financial assets 1,198 467
Financial assets, at fair value 1,198 467
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 1,198 467
Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   (4,860)
Financial liabilities, at fair value   (4,860)
Derivatives | Cash flow hedges | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities   (4,860)
Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (1,171,972) (1,155,786)
Financial liabilities, at fair value (1,130,183) (1,102,089)
Long-term debt | Carrying value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities (1,171,972) (1,155,786)
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 600 1,024
Level 2 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 2,290  
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 3,103 5,469
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 1,198 467
Level 2 | Derivatives | Cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value   (4,860)
Level 2 | Long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (1,130,183) (1,102,089)
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