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BANK INDEBTEDNESS AND LONG-TERM DEBT - Principal repayments (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Principal $ 1,543,678 $ 1,171,972
Long-Term Debt Besides Credit Facility Variable Interest Payments    
Disclosure of detailed information about borrowings [line items]    
Interest 373,988  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 1,559,117  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Less than one year    
Disclosure of detailed information about borrowings [line items]    
Interest 59,758  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Less than one year | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 219  
Long-Term Debt Besides Credit Facility Variable Interest Payments | One - two years    
Disclosure of detailed information about borrowings [line items]    
Interest 59,741  
Long-Term Debt Besides Credit Facility Variable Interest Payments | One - two years | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 437,156  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Two - three years    
Disclosure of detailed information about borrowings [line items]    
Interest 59,723  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Two - three years | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 15,887  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Three - four years    
Disclosure of detailed information about borrowings [line items]    
Interest 59,704  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Three - four years | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 503,924  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Four - five years    
Disclosure of detailed information about borrowings [line items]    
Interest 38,911  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Four - five years | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal 365  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Thereafter    
Disclosure of detailed information about borrowings [line items]    
Interest 96,151  
Long-Term Debt Besides Credit Facility Variable Interest Payments | Thereafter | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Principal $ 601,566