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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Net prior service credits $ 3,965 $ 3,843 $ 1,274
Net actuarial loss (17,630) (9,821) (11,407)
Accumulated other comprehensive loss (13,665) (5,978) (10,133)
Deferred tax (267) (420) (347)
Accumulated other comprehensive loss, net of tax $ (13,932) $ (6,398) $ (10,480)