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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)
3 Months Ended 6 Months Ended
Sep. 30, 2021
$ / shares
Sep. 30, 2021
SFr / shares
Sep. 30, 2020
$ / shares
Sep. 30, 2020
SFr / shares
Sep. 30, 2021
$ / shares
Sep. 30, 2021
SFr / shares
Sep. 30, 2020
$ / shares
Sep. 30, 2020
SFr / shares
Statement of Stockholders' Equity [Abstract]                
Cash dividends per share (in dollars per share) | (per share) $ 0.95 SFr 0.87 $ 0.87 SFr 0.79 $ 0.95 SFr 0.87 $ 0.87 SFr 0.79