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Employee Retirement Plans (Expected Return on Plan Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]        
Interest cost $ 283 $ 575 $ 1,333 $ 1,729
Expected return on assets (653) (722) (1,947) (2,164)
Net periodic benefit income $ (370) $ (147) $ (614) $ (435)