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Employee Retirement Plans (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement [Abstract]      
Unrecognized actuarial (gain) loss $ (1,202) $ 73 $ (1,469)
Unrecognized prior service credit $ 0 $ 0 $ 0