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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) | 1 Months Ended | 12 Months Ended
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Sep. 30, 2023 $ / shares | Sep. 30, 2023 SFr / shares | Sep. 30, 2022 $ / shares | Sep. 30, 2022 SFr / shares | Sep. 30, 2021 $ / shares | Sep. 30, 2021 SFr / shares | Mar. 31, 2024 $ / shares | Mar. 31, 2023 $ / shares | Mar. 31, 2022 $ / shares
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) | (per share) | $ 1.16 | SFr 1.06 | $ 0.98 | SFr 0.96 | $ 0.95 | SFr 0.87 | $ 1.19 | $ 1.00 | $ 0.95

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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 -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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