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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parentheticals) - $ / shares
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared per common share (in dollars per share) $ 1.12 $ 1.08 $ 0.96