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v3.19.1

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, 2019 USD ($) | May 31, 2019 CHF (SFr) | Sep. 30, 2018 SFr / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 SFr / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 SFr / shares | Sep. 30, 2016 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Mar. 31, 2019 CHF (SFr) SFr / shares shares | Mar. 31, 2018 SFr / shares shares | Mar. 31, 2014 USD ($)
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal share capital issued (CHF) | SFr |  |  |  |  |  |  |  |  |  |  |  | SFr 43.3 |  |
Shares, issued (in shares) | shares |  |  |  |  |  |  |  |  | 173,106,620 |  |  | 173,106,620 | 173,107,000 |
Shares, par value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  |  |  | SFr 0.25 | SFr 0.25 |
Treasury shares (in shares) | shares |  |  |  |  |  |  |  |  | 7,243,733 |  |  | 7,243,733 | 8,527,000 |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  | 34,621,324 |  |  | 34,621,324 |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unappropriated retained earnings |  |  |  |  |  |  |  |  | $ 945,200,000 |  |  | SFr 940.9 |  |
Payment of cash dividends |  |  |  | $ 114,000,000.0 |  | $ 104,200,000 |  | $ 93,100,000 | $ 113,971,000 | $ 104,248,000 | $ 93,093,000 |  |  |
Cash dividends per share (in dollars/CHF per share) | (per share) |  |  | SFr 0.67 | $ 0.69 | SFr 0.61 | $ 0.63 | SFr 0.56 | $ 0.57 | $ 690.00 | $ 630.00 | $ 570.00 |  |  |
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 |  |  |  |  |  |  |  |  | $ 9,600,000 |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of currency translation loss included in other income (expense), net |  |  |  |  |  |  |  |  | $ 510,000 | $ 0 | $ 0 |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditionally authorized shares (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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  | 25,000,000 |  |  | 25,000,000 |  |
March 2014 program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  | $ 250,000,000.0
March 2017 program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount |  |  |  |  |  |  |  |  | 250,000,000 |  | $ 250,000,000.0 |  |  |
Period for which repurchase program will remain in effect |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Amount of authorized shares available for repurchase |  |  |  |  |  |  |  |  | $ 187,400,000 |  |  |  |  |
Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends | $ 122,400,000 | SFr 121.8 |  |  |  |  |  |  |  |  |  |  |  |

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