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Shareholders' Equity (Narrative) (Details) SFr / shares in Units, $ / shares in Units, SFr in Millions | 1 Months Ended | 11 Months Ended | 12 Months Ended | 38 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) | May 31, 2018 CHF (SFr) | Sep. 30, 2017 SFr / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 SFr / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 SFr / shares | Sep. 30, 2015 USD ($) $ / shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Apr. 30, 2017 USD ($) shares | Mar. 31, 2018 CHF (SFr) SFr / shares shares | Mar. 31, 2017 SFr / shares | Mar. 31, 2017 USD ($) 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 |  |  |  | 173,106,620 |  | 173,106,620 |
Shares, par value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0.25 | SFr 0.25 |  |
Treasury shares (in shares) | shares |  |  |  |  |  |  |  |  | 8,526,642 | 8,526,642 |  |  |  | 8,526,642 |  | 10,727,000 |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  |  |  | 50,000,000 |  | 50,000,000 |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unappropriated retained earnings |  |  |  |  |  |  |  |  | $ 818,000,000 | $ 818,000,000 |  |  |  | SFr 782.3 |  |  |
Payment of cash dividends | $ |  |  |  | $ 104,200,000 |  | $ 93,100,000 |  | $ 85,900,000 |  | $ 104,248,000 | $ 93,093,000 | $ 85,915,000 |  |  |  |  |
Cash dividends per share (in dollars/CHF per share) | (per share) |  |  | SFr 0.61 | $ 0.63 | SFr 0.56 | $ 0.57 | SFr 0.51 | $ 0.53 |  | $ 0.63 | $ 0.57 | $ 0.53 |  |  |  |  |
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% |  |  |
Portion of appropriated retained earnings representing legal reserves | $ |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, amount | $ |  |  |  |  |  |  |  |  |  | $ 30,722,000 | $ 83,786,000 | $ 70,358,000 |  |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conditionally authorized shares (in shares) | shares |  |  |  |  |  |  |  |  | 25,000,000 | 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 |  |  |  | 25,000,000 |  |  |
March 2014 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 |  |  |  |  |  |  | $ 250,000,000.0
Purchases of registered shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 9,113,000 |  |  |  |
Share repurchase, amount | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,983,000 |  |  |  |
March 2017 program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount | $ |  |  |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 |  |  |  |  |  | $ 250,000,000.0 |
Period for which repurchase program will remain in effect |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Purchases of registered shares (in shares) | shares |  |  |  |  |  |  |  |  | 843,000 |  |  |  |  |  |  |  |
Share repurchase, amount | $ |  |  |  |  |  |  |  |  | $ 30,107,000 |  |  |  |  |  |  |  |
Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends | $ 115,700,000 | SFr 110.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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