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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parentheticals) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared per common share (in dollars per share) $ 1.51 $ 1.30 $ 1.12