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v3.23.3

Shareholders' Equity - Narrative (Details) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 39 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) shares | Jul. 31, 2022 USD ($) | Apr. 30, 2021 USD ($) | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) SFr / shares shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2022 SFr / shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) SFr / shares shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2022 SFr / shares | Jul. 27, 2023 USD ($) shares | Mar. 31, 2023 shares | May 31, 2020 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  |  |  |  |  |  | 900 |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 124,096,000 |  | $ 116,942,000 |  | $ 219,172,000 |  | $ 237,561,000 |  |  |  |
Maximum percentage of shares held by the company and its subsidiaries | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum shares available for purchase (in shares) | shares | 17,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, cancel, percentage |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Treasury, at cost, shares (in shares) | shares |  |  |  | 16,029 | 16,029 |  |  | 16,029 | 16,029 |  |  |  | 13,763 |
Cash dividends per share (in dollars per share) | (per share) |  |  |  | $ 1.19 | SFr 1.06 | $ 1.00 | SFr 0.96 | $ 1.19 | SFr 1.06 | $ 1.00 | SFr 0.96 |  |  |
Payment of cash dividends |  |  |  | $ 187,199,000 |  | $ 162,681,000 |  | $ 187,199,000 |  | $ 162,681,000 |  |  |  |
2020 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program |  | $ 1,500,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Increase in authorized amount |  | $ 500,000,000 | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  |  |  |  |  |  | 2,600 |  |  |  | 16,700 |  |
Aggregate purchase price |  |  |  |  |  |  |  | $ 159,100,000 |  |  |  | $ 1,200,000,000 |  |
2023 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  |  |  |  |  |  | 900 |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  | $ 60,100,000 |  |  |  |  |  |
Period to complete share repurchase program | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost of share |  |  |  |  |  |  |  | 30,200,000 |  |  |  |  |  |
Amount available for repurchase |  |  |  | $ 940,000,000.0 | SFr 940,000,000.0 |  |  | $ 940,000,000.0 | SFr 940,000,000.0 |  |  |  |  |

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