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EMPLOYEE BENEFIT PLANS - Change in Benefit Obligation and Change in Plan Assets (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, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of the year $ 121,518 $ 119,609 $ 120,341
Service cost 6,505 5,657 4,955
Interest cost 4,063 4,237 4,859
Net actuarial gain (13,563) (3,466) (6,761)
Benefits paid (5,018) (4,519) (3,785)
Benefit obligation, end of the year 113,505 121,518 119,609
Changes in plan assets      
Fair value of plan assets, beginning of the year 0 0 0
Employer contributions 5,018 4,519 3,785
Benefits paid (5,018) (4,519) (3,785)
Fair value of plan assets, end of the year $ 0 $ 0 $ 0