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SHARE-BASED PAYMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2025
CAD ($)
category
$ / shares
shares
Mar. 31, 2024
CAD ($)
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of categories | category 2  
Expense from share-based payment transactions with employees | $ $ 61.5 $ 34.5
Weighted average market share price for stock options (in dollars per share) | $ / shares $ 30.57 $ 30.33
Number of trading days (in days) 20 days  
Cash-settled award vesting period (in years) 3 years  
Stock option plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Weighted average fair value of stock options (in dollars per share) | $ / shares $ 9.58 $ 10.12
Equity-settled RSU    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Equity-settled award vesting period (in years) 3 years  
Equity-settled PSU    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Equity-settled award vesting period (in years) 3 years  
Stock purchase plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Employer matching contribution, matching, percentage 50.00%  
Employer matching contribution, percent of employees' gross pay (in percent) 3.00%  
Cash-settled DSU    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of days prior to date of incentive becoming payable (in days) 5 days  
DSU plans    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Shares vested and outstanding, granted under previous plans (in shares) | shares 742,157 833,090
Discontinued operations    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from share-based payment transactions with employees | $   $ 2.8
Bottom of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercisable options (in years) 4 years  
Bottom of range | Equity-settled PSU    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Equity-settled share-based payment arrangement factor percentage (in percent) 0.00%  
Bottom of range | PSU plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled share-based payment arrangement factor percentage (in percent) 0.00%  
Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercisable options (in years) 7 years  
Top of range | Equity-settled PSU    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Equity-settled share-based payment arrangement factor percentage (in percent) 200.00%  
Top of range | PSU plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled share-based payment arrangement factor percentage (in percent) 200.00%