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EMPLOYEE BENEFITS - Change in plan assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accrued benefit obligations:    
Net defined benefit liability (asset) at beginning of period $ 25,486  
Net defined benefit liability (asset) at end of period 24,585 $ 25,486
Present value of defined benefit obligation [member]    
Accrued benefit obligations:    
Net defined benefit liability (asset) at beginning of period 29,162 32,721
Acquisition of subsidiary 0 1,055
Interest cost 1,015 579
Service cost 610 553
Assumption changes 561 (5,043)
Transfers and benefits paid (2,590) (2,111)
Foreign exchange (376) 1,408
Net defined benefit liability (asset) at end of period 28,382 29,162
Plan assets [member]    
Accrued benefit obligations:    
Net defined benefit liability (asset) at beginning of period 3,676 3,589
Interest cost 125 (170)
Company contributions 0 179
Foreign exchange (4) 78
Net defined benefit liability (asset) at end of period $ 3,797 $ 3,676