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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)
9 Months Ended
Dec. 31, 2018
$ / shares
Dec. 31, 2018
SFr / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2017
SFr / shares
Statement of Stockholders' Equity [Abstract]        
Cash dividend per share (in dollars per share) | (per share) $ 0.69 SFr 0.67 $ 0.63 SFr 0.61