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Shareholders' Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Mar. 31, 2017 USD ($) shares | Sep. 30, 2019 SFr / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 SFr / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2019 SFr / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 SFr / shares | Sep. 30, 2018 USD ($) $ / shares
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | shares |  | 172,400,000 | 172,400,000 |  |  | 172,400,000 | 172,400,000 |  |
Cash dividends per share (in dollars/CHF per share) | (per share) |  | SFr 0.73 | $ 0.74 | SFr 0.67 | $ 0.69 | SFr 0.73 | $ 0.74 | SFr 0.67 | $ 0.69
Payment of cash dividends | $ |  |  | $ 124,200,000 |  | $ 114,000,000.0 |  | $ 124,180,000 |  | $ 113,971,000

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- Definition Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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