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Retirement Plans (Schedule of Allocation of Plan Assets) (detail)
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
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% 97.00%
Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 1.00%  
Percentage of Plan Assets 1.00% 3.00%