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Employee Retirement Plans (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]      
Unrecognized actuarial (gain) $ (1,469) $ (1,407) $ 399
Unrecognized prior service credit 0 $ 0 $ 0
Amounts expected to be reclassified from accumulated other comprehensive income (loss) during 2020:      
Unrecognized actuarial (loss) 0    
Unrecognized prior service credit $ 0