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PENSION BENEFIT PLANS - Fair Value of the Assets Pension Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, at beginning of year $ 0 $ 0
Employer direct benefit payments 400 359
Benefits paid and other (400) (359)
Fair value of plan assets, at end of year $ 0 $ 0