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STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended 22 Months Ended
Mar. 31, 2024
CAD ($)
shares
$ / shares
Mar. 31, 2023
CAD ($)
shares
$ / shares
Mar. 31, 2024
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Subscription rate 10.00%   10.00%
Maximum employee subscription | $ $ 10    
Employer match rate 20.00%    
Employer match rate, employee salary maximum percentage 1.00%   1.00%
Employer match rate, employee salary maximum | $ $ 2   $ 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 $ 57.26 $ 49.16  
Common shares held in trust (in shares)     725,290
Stock options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Shares remaining for future grants (in shares) 1,751,082 1,894,578 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   5,991,839
Maximum shares issuable to a single person, percent 5.00%   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   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) 161,568 210,678  
Liabilities from share-based payment transactions | $ $ 13,875 $ 36,177 $ 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) 126,944 152,690  
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) 32,498 33,998  
Liabilities from share-based payment transactions | $ $ 19,661 $ 22,565 $ 19,661
Shares redeemed (in shares) 0 0