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Shareholders' Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) SFr / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 SFr / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2020 USD ($) SFr / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 SFr / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 shares | Mar. 31, 2017 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends per share (in dollars/CHF per share) | (per share) |  | SFr 0.79 | $ 0.87 | SFr 0.73 | $ 0.74 | SFr 0.79 | $ 0.87 | SFr 0.73 | $ 0.74 |  |
Payment of cash dividends | $ |  |  | $ 146,700,000 |  | $ 124,200,000 |  | $ 146,705,000 |  | $ 124,180,000 |  |
Conditional capital reserved (in shares) | shares |  | 17,310,662 | 17,310,662 |  |  | 17,310,662 | 17,310,662 |  |  | 34,621,324 |
March 2017 |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program | $ |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Shares authorized to be repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 17,300,000
May 2020 |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program | $ | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) | shares | 17,300,000 |  |  |  |  |  |  |  |  |  |
Period to complete share repurchase program | 3 years |  |  |  |  |  |  |  |  |  |
Amount available for repurchase | $ |  | SFr 227,600,000 | $ 227,600,000 |  |  | SFr 227,600,000 | $ 227,600,000 |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conditional capital reserved (in shares) | shares |  | 25,000,000 | 25,000,000 |  |  | 25,000,000 | 25,000,000 |  |  |  |

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