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STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
CAD ($)
shares
$ / shares
Mar. 31, 2024
CAD ($)
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Subscription rate 10.00%  
Maximum employee subscription | $ $ 10  
Employer match rate 20.00%  
Employer match rate, employee salary maximum percentage 1.00%  
Employer match rate, employee salary maximum | $ $ 2  
Maximum term of options 7 years  
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise (in dollars per share) | $ / shares $ 40.13 $ 57.26
Common shares held in trust (in shares) 1,057,455 725,290
Stock options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Shares remaining for future grants (in shares) 1,560,749 1,751,082
Stock options | 1995 Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Shares available for purchase for cancellation (in shares) 5,991,839  
Maximum shares issuable to a single person, percent 5.00%  
Vesting period 4 years  
Stock options | 2006 Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Shares available for purchase for cancellation (in shares) 5,159,000  
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 3 months  
Number of other equity instruments granted in share-based payment arrangement (in shares) 255,055 161,568
Liabilities from share-based payment transactions | $ $ 9 $ 13,875
Performance-based RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 3 months  
Number of other equity instruments granted in share-based payment arrangement (in shares) 210,803 126,944
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of other equity instruments granted in share-based payment arrangement (in shares) 43,456 32,498
Liabilities from share-based payment transactions | $ $ 17,031 $ 19,661
Shares redeemed (in shares) 0 0