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Schedule of Dividends Declared (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Stockholders' Equity [Abstract]      
Dividends declared $ 49,973 $ 49,766 $ 51,370
Dividend per share $ 1.00 $ 1.00 $ 1.00