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Accumulated Other Comprehensive Loss (Reclassifications out of Accumulated Other Comprehensive Loss to Net Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Tax benefit $ (159,410) $ (85,368) $ (153,349)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax 3,050 3,536 577
Tax benefit (1,202) (1,394) (227)
Net of tax $ 1,848 $ 2,142 $ 350