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v3.22.1

Shareholders' Equity (Narrative) (Details) SFr / shares in Units, $ / shares in Units, SFr in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
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May 31, 2022 SFr / shares | May 31, 2022 USD ($) $ / shares | Sep. 30, 2021 SFr / shares | Sep. 30, 2021 USD ($) $ / shares | Apr. 30, 2021 USD ($) | Sep. 30, 2020 SFr / shares | Sep. 30, 2020 USD ($) $ / shares | May 31, 2020 USD ($) shares | Sep. 30, 2019 SFr / shares | Sep. 30, 2019 USD ($) $ / shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares | Mar. 31, 2022 CHF (SFr) SFr / shares shares | Mar. 31, 2021 SFr / shares shares | Dec. 31, 2020 shares | Mar. 31, 2017 USD ($) shares
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal share capital issued (CHF) | SFr |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 43.3 |  |  |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 173,106,620 |  |  | 173,106,620 |  | 17,310,662 |
Shares, par value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0.25 | SFr 0.25 |  |
Treasury shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 7,854,600 |  |  | 7,854,600 | 4,799,000 |  |
Shares that may be issued out of conditional capital (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  | 50,000,000 | 50,000,000 |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unappropriated retained earnings |  |  |  |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  | SFr 1,700.0 |  |  |
Payment of cash dividends | $ |  |  |  | $ 159,400,000 |  |  | $ 146,700,000 |  |  | $ 124,200,000 | $ 159,410,000 | $ 146,705,000 | $ 124,180,000 |  |  |  |
Cash dividends paid per share (in dollars/CHF per share) | (per share) |  |  | SFr 0.87 | $ 0.95 |  | SFr 0.79 | $ 0.87 |  | SFr 0.73 | $ 0.74 | $ 0.95 | $ 0.87 | $ 0.74 |  |  |  |
Legal Reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of annual net income to be retained in legal reserves |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Threshold of legal reserves as a percentage of issued and outstanding aggregate par value per share capital at which a minimum percentage of annual net income is no longer required to be retained |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  | 20.00% |  |  |
Portion of appropriated retained earnings representing legal reserves | $ |  |  |  |  |  |  |  |  |  |  | $ 10,400,000 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share (in dollars/CHF per share) | (per share) | SFr 0.96 | $ 1.04 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | $ |  | $ 172,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares that may be issued out of conditional capital (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  | 25,000,000 |  |  |
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares that may be issued out of conditional capital (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  | 25,000,000 |  |  |
March 2017 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Shares approved (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,300,000
May 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  |  |  | $ 1,000,000,000 |  |  | $ 250,000,000 |  |  | $ 1,000,000,000 |  |  |  |  |  |
Shares approved (in shares) | shares |  |  |  |  |  |  |  | 17,300,000 |  |  | 17,311,000 |  |  | 17,311,000 |  |  |
Period for which repurchase program will remain in effect |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Increase in authorized amount | $ |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of authorized shares available for repurchase | $ |  |  |  |  |  |  |  |  |  |  | $ 423,700,000 |  |  |  |  |  |

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