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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Allowance for doubtful accounts (Details) - Accumulated impairment - CAD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of changes in allowance account for credit losses of financial assets [abstract]    
Balance, at April 1 $ (6,241) $ (6,501)
Provision for doubtful accounts 2,722 2,135
Amounts written off (536) (201)
Recoveries (239) (2,114)
Foreign exchange 988 (80)
Balance, at March 31 $ (9,176) $ (6,241)