XML 62 R111.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Deferred Stock Unit Activity (Detail) (USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding $ 50.48 $ 50.56 $ 49.80
Weighted-average Grant-Date Fair Value-Dividend equivalents reinvested $ 53.82 $ 46.73 $ 50.49
Weighted-average Grant-Date Fair Value-Retirement distribution $ 59.65    
Weighted-average Grant-Date Fair Value-Granted $ 49.47 $ 50.48 $ 54.02
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding $ 48.68 $ 50.48 $ 50.56
Number of Shares Beginning Balance Outstanding 144,007 114,580 92,365
Number of Shares-Dividend equivalents reinvested 2,492 2,472 1,843
Number of Shares-Retirement distribution (26,661)    
Number of Shares-Granted 26,550 26,955 20,372
Number of Shares Ending Balance Outstanding 146,388 144,007 114,580