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STOCK-BASED COMPENSATION (Narrative) (Details)	3 Months Ended		9 Months Ended
STOCK-BASED COMPENSATION (Narrative) (Details)	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