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SHARE-BASED PAYMENTS - Narrative (Details)
 12 Months Ended
Mar. 31, 2021
numberOfCategories
$ / shares
shares
Mar. 31, 2020
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of categories | numberOfCategories 2  
Exercisable options, period 4 years  
Number of shares (in shares) | shares 11,205,103 11,892,268
Number of days prior to incentive compensation, payable to executives 20 days  
Vesting period 3 years  
Shares vested and outstanding, granted under previous plans (in shares) | shares 943,250 1,044,359
Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercisable options, period 7 years  
Employee Stock Option Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Weighted average market share price | $ / shares $ 30.19 $ 34.77
Weighted average market share price, granted (in dollars per share)ket Price, Granted During Period | $ / shares $ 5.22 $ 4.98
Employee Stock Purchase Plan (ESPP)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Employer matching contribution, percent of employees' gross pay 3.00%  
Employer matching contribution, matching, percentage 50.00%  
Performance Share Unit Plan (PSU) | Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment arrangement 200.00%  
Performance Share Unit Plan (PSU) | Bottom of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based payment arrangement 0.00%