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Retirement Plans (Schedule of Allocation of Plan Assets) (detail)
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 100.00%    
Percentage of Plan Assets   100.00% 100.00%
Equity Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 99.00%    
Percentage of Plan Assets   99.00% 99.00%
Cash [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 1.00%    
Percentage of Plan Assets   1.00% 1.00%