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EMPLOYEE BENEFIT PLANS - Components of Net Postretirement Medical Expense (Details) - Officer Medical Plan - Other Postretirement Benefits Plan - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,505	$ 5,657	$ 4,955
Interest cost	4,063	4,237	4,859
Total postretirement medical expense	$ 10,568	$ 9,894	$ 9,814

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