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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, 2013
Mar. 31, 2012
Mar. 31, 2011
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Tax (expense) benefit $ (149,253) $ (103,919) $ (43,370)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
     
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax (1,524) (706) (328)
Tax (expense) benefit 600 287 129
Net of tax $ (924) $ (419) $ (199)