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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]      
Net prior service credits $ 3,647 $ 3,965 $ 3,843
Net actuarial loss (22,722) (17,630) (9,821)
Accumulated other comprehensive loss (19,075) (13,665) (5,978)
Deferred tax (941) (267) (420)
Accumulated other comprehensive loss, net of tax $ (20,016) $ (13,932) $ (6,398)