Amount of noncash expense for share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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STOCK-BASED COMPENSATION (Company Restricted Stock and Total Stock-Based Compensation) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Compensation related to stock option and restricted stock plans, net of taxes and adjustments			$ 8,449,138	$ 9,610,243
Stock Options Plans
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
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
Restricted Stock
Summary of the status and changes in restricted stock [Roll Forward]
Outstanding at Beginning of Year (in shares)			614,739
Awards granted (in shares)			4,062		52,735
Vested during the period, net of cancellations (in shares)			(2,808)
Forfeited during the period (in shares)			0
Outstanding at End of Period (in shares)	615,993		615,993		614,739
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at beginning period (in dollars per share)			$ 101.99
Grant date fair value (in dollars per share)			188.38		$ 106.28
Vested during the period, net of cancellations (in dollars per share)			118.21
Cancelled during the period (in dollars per share)			0
Outstanding at ending period (in dollars per share)	$ 102.49		$ 102.49		$ 101.99
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
Equity Securities
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Compensation related to stock option and restricted stock plans, net of taxes and adjustments	$ 4,265,048	$ 5,026,643	$ 8,449,138	$ 9,610,243