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Employee Benefit and Stock Compensation Plans Actuarial Assumptions for Plan Benefits (Details)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 0.00% 0.00% 0.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 8.00% 8.00% 8.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.75% 4.18% 0.00%