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STOCK-BASED COMPENSATION (Narrative) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (in shares) | shares | 191,652 |  | 191,652 |
Weighted-average fair value at the grant date | $ / shares | $ 56.55 | $ 60.43 | $ 50.42 | $ 64.49
Grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 90.23
Compensation related to stock option and restricted stock plans, net of taxes and adjustments |  |  | $ 14,508,703 | $ 22,933,287
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares of authorized common stock reserved for issuance (in shares) | shares | 3,350,000 |  | 3,350,000 |
Total unrecognized stock-based compensation expense related to non-vested stock options | $ 8,400,000 |  | $ 8,400,000 |
Weighted average period for recognition |  |  | 3 years 6 months |
Compensation related to stock option and restricted stock plans, net of taxes and adjustments | $ 854,647 | $ 1,168,033 | $ 2,987,621 | $ 4,394,143
Employee Stock Option | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option, expiration period |  |  | 10 years |
Vesting period |  |  | 6 years |
Employee Stock Option | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted Stock Award | installment | 6 |  | 6 |
Awards granted (in shares) | shares |  |  | 39,675 |
Grant date fair value (in dollars per share) | $ / shares |  |  | $ 96.14 |
Restricted stock | shares |  |  |  | 11,223
Compensation related to stock option and restricted stock plans, net of taxes and adjustments | $ 4,043,813 | $ 5,162,777 | $ 11,521,082 | $ 18,539,144
Unvested restricted stock awards | $ 29,400,000 |  | $ 29,400,000 |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 10 years |
Weighted average period for recognition |  |  | 2 years 8 months 12 days |
Service Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 10 years |
Restricted Stock Award | installment | 6 |  | 6 |

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