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SHARE-BASED PAYMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2024
CAD ($)
category
$ / shares
shares
Mar. 31, 2023
CAD ($)
$ / shares
shares
Aug. 31, 2023
instrument
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of instruments reserved for issuance in share-based arrangement (in instruments) | instrument     10,000,000
Number of categories | category 2    
Expense from share-based payment transactions with employees | $ $ 34.5 $ 28.5  
Weighted average market share price for stock options (in dollars per share) | $ / shares $ 30.33 $ 31.95  
Shares vested and outstanding, granted under previous plans (in shares) | shares 833,090 850,392  
Number of trading days (in days) 20 days    
Cash-settled award vesting period (in years) 3 years    
Discontinued operations      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees | $ $ 2.8 $ 0.8  
Bottom of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercisable options (in years) 4 years    
Top of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercisable options (in years) 7 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 $ 10.12 $ 10.85  
Cash-settled PSU | Bottom of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Cash-settled share-based payment arrangement factor percentage (in percent) 0.00%    
Cash-settled PSU | Top of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Cash-settled share-based payment arrangement factor percentage (in percent) 200.00%    
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%    
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    
Equity-settled PSU | Bottom of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Equity-settled share-based payment arrangement factor percentage (in percent) 0.00%    
Equity-settled PSU | Top of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Equity-settled share-based payment arrangement factor percentage (in percent) 200.00%    
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