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Employee Retirement Plans (Expected Return on Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]      
Interest cost $ 2,327 $ 2,380 $ 2,529
Expected return on assets (2,886) (3,070) (2,901)
Net periodic benefit (income) $ (559) $ (690) $ (372)