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STOCK-BASED COMPENSATION (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
STOCK-BASED COMPENSATION (Narrative) (Details)	Sep. 30, 2021 USD ($) installment $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2021 USD ($) installment $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Mar. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares) \| shares	156,166		156,166
Vesting percentage			100.00%
Weighted-average fair value at the grant date (in dollars per share) \| $ / shares	$ 100.55	$ 47.61	$ 97.25	$ 47.31
Compensation related to stock option and restricted stock plans, net of taxes and adjustments			$ 8,449,138	$ 9,610,243
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	$ 7,800,000		$ 7,800,000
Weighted average period for recognition			3 years 2 months 12 days
Compensation related to stock option and restricted stock plans, net of taxes and adjustments	$ 909,350	$ 1,086,239	$ 1,852,977	2,132,974
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]
Number of installments \| installment	6		6
Awards granted (in shares) \| shares			4,062		52,735
Grant date fair value (in dollars per share) \| $ / shares			$ 188.38		$ 106.28
Compensation related to stock option and restricted stock plans, net of taxes and adjustments	$ 3,355,698	$ 3,940,404	$ 6,596,161	$ 7,477,269
Unvested restricted stock awards	$ 21,400,000		$ 21,400,000
Service Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			10 years
Number of installments \| installment	6		6
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			10 years
Weighted average period for recognition			2 years 7 months 6 days