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SHARE-BASED PAYMENTS - Narrative (Details) | 12 Months Ended
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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% |

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