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Shareholders' Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2022 USD ($) shares | Apr. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2022 USD ($) SFr / shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2021 SFr / shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2022 USD ($) SFr / shares | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2021 SFr / shares | May 31, 2020 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) | (per share) |  |  | $ 1.00 | SFr 0.96 | $ 0.95 | SFr 0.87 | $ 1.00 | SFr 0.96 | $ 0.95 | SFr 0.87 |
Payment of cash dividends |  |  | $ 162,681,000 |  | $ 159,410,000 |  | $ 162,681,000 |  | $ 159,410,000 |  |
May 2020 |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program | $ 1,500,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  |  | $ 250,000,000
Shares authorized to be repurchased (in shares) | shares | 17,300,000 |  |  |  |  |  |  |  |  |  | 17,300,000
Increase in authorized amount | $ 500,000,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |
Amount available for repurchase |  |  | $ 686,300,000 | SFr 686,300,000 |  |  | $ 686,300,000 | SFr 686,300,000 |  |  |
Period to complete share repurchase program | 3 years |  |  |  |  |  |  |  |  |  |

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