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Shareholders' Equity (Narrative) (Details) | 1 Months Ended | 12 Months Ended | 37 Months Ended |  |  |
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May 26, 2017 USD ($) | May 26, 2017 CHF (SFr) | Mar. 31, 2017 USD ($) shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2016 SFr / shares | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2015 SFr / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2014 CHF (SFr) SFr / shares | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares | Mar. 31, 2017 USD ($) shares | Mar. 31, 2017 CHF (SFr) SFr / shares shares | Mar. 31, 2016 SFr / shares | Sep. 30, 2008 shares
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal share capital issued (CHF) | SFr |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 43,276,655 |  |
Shares, issued (in shares) | shares |  |  | 173,106,620 |  |  |  |  |  |  | 173,106,620 | 173,106,620 |  | 173,106,620 | 173,106,620 |  |
Shares, par value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0.25 | SFr 0.25 |
Treasury shares (in shares) | shares |  |  | 10,726,943 |  |  |  |  |  |  | 10,726,943 | 10,697,000 |  | 10,726,943 | 10,726,943 |  |
Conditionally authorized shares (in shares) | shares |  |  | 50,000,000 |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  | 50,000,000 | 50,000,000 |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unappropriated retained earnings |  |  | $ 740,300,000 |  |  |  |  |  |  | $ 740,300,000 |  |  | $ 740,300,000 | SFr 740,700,000 |  |
Payment of cash dividends | $ |  |  |  | $ 93,100,000 |  | $ 85,900,000 |  | $ 43,800,000 |  | $ 93,093,000 | $ 85,915,000 | $ 43,767,000 |  |  |  |
Cash dividends per share (in dollars/CHF per share) | (per share) |  |  |  | $ 0.57 | SFr 0.56 | $ 0.53 | SFr 0.51 | $ 0.27 | SFr 0.26 | $ 0.57 | $ 0.53 | $ 0.27 |  |  |  |
Approved dividend out of retained earnings (CHF) | SFr |  |  |  |  |  |  |  |  | SFr 43,100,000 |  |  |  |  |  |  |
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% |  |  | 20.00% | 20.00% |  |
Portion of appropriated retained earnings representing legal reserves | $ |  |  | $ 9,600,000 |  |  |  |  |  |  | $ 9,600,000 |  |  | $ 9,600,000 |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, amount | $ |  |  |  |  |  |  |  |  |  | 83,786,000 | $ 70,358,000 | $ 1,663,000 |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
March 2014 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  | 250,000,000 |  |  |  |  |  |  | 250,000,000 | $ 250,000,000.0 |  | $ 250,000,000 |  |  |
Repurchases of registered shares/common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 9,093,000 |  |  |
Share repurchase, amount | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,358,000 |  |  |
March 2017 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  | $ 250,000,000.0 |  |  |  |  |  |  | $ 250,000,000.0 |  |  | $ 250,000,000.0 |  |  |
Period for which repurchase program will remain in effect |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Repurchases of registered shares/common stock (in shares) | shares |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, amount | $ |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends | $ 100,000,000 | SFr 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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