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RIGHT-OF-USE ASSETS AND LEASE LIABILITIES - Right-of-use assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of right-of-use assets [Abstract]    
Right-of-use assets, beginning balance $ 105,661 $ 94,212
Additions 29,040 37,978
Amortization (33,824) (29,656)
Acquisition of subsidiaries 14,766 5,546
Exchange and other adjustments 6,648 (2,419)
Right-of-use assets, ending balance 122,291 105,661
Buildings    
Reconciliation of right-of-use assets [Abstract]    
Right-of-use assets, beginning balance 85,588 79,880
Additions 17,577 25,411
Amortization (24,129) (21,596)
Acquisition of subsidiaries 14,766 4,184
Exchange and other adjustments 5,000 (2,291)
Right-of-use assets, ending balance 98,802 85,588
Vehicles and equipment    
Reconciliation of right-of-use assets [Abstract]    
Right-of-use assets, beginning balance 20,073 14,332
Additions 11,463 12,567
Amortization (9,695) (8,060)
Acquisition of subsidiaries 0 1,362
Exchange and other adjustments 1,648 (128)
Right-of-use assets, ending balance $ 23,489 $ 20,073