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EMPLOYEE BENEFIT PLANS - Healthcare Cost Trend Rates (Details) - Officer Medical Plan - Other Postretirement Benefits Plan	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year, Pre 65	6.30%	6.55%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Pre 65	4.50%	4.50%
Health care cost trend rate assumed for next year, Post 65	6.45%	6.75%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Post 65	4.50%	4.50%

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- Definition

Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Post 65

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Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Pre 65

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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