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Schedule of Dividends Declared (Detail) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Stockholders Equity Note [Abstract]        
Dividends declared $ 0 $ 11,811,000 $ 0 $ 34,965,000
Dividend per share   $ 0.25   $ 0.75