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Schedule of Dividends Declared (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Stockholders Equity Note [Abstract]      
Dividends declared $ 34,965 $ 49,127 $ 49,973
Dividend per share $ 0.75 $ 1.00 $ 1.00