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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) | 1 Months Ended | 12 Months Ended
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Sep. 30, 2020 $ / shares | Sep. 30, 2020 SFr / shares | Sep. 30, 2019 $ / shares | Sep. 30, 2019 SFr / shares | Sep. 30, 2018 $ / shares | Sep. 30, 2018 SFr / shares | Mar. 31, 2021 $ / shares | Mar. 31, 2020 $ / shares | Mar. 31, 2019 $ / shares
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |  |
Cash dividends per share (in dollars) | (per share) | $ 0.87 | SFr 0.79 | $ 0.74 | SFr 0.73 | $ 0.69 | SFr 0.67 | $ 0.87 | $ 0.74 | $ 0.69

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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