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Accumulated Other Comprehensive Loss (Reclassifications out of Accumulated Other Comprehensive Loss to Net Income) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Tax benefit $ (148,599) $ (149,253) $ (103,919)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
     
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax 2,728 1,524 706
Tax benefit (1,076) (600) (287)
Net of tax $ 1,652 $ 924 $ 419