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Shareholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2017 SFr / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2016 SFr / shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2017 SFr / shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2016 SFr / shares | Mar. 31, 2014 USD ($)
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |
Authorized amount in buyback program | $ 250,000,000.0 |  |  |  |  |  |  |  |  | $ 250,000,000.0
Shares authorized to be repurchased (in shares) | shares | 17.3 |  |  |  |  |  |  |  |  |
Period to complete share repurchase program | 3 years |  |  |  |  |  |  |  |  |
Repurchase of shares (in shares) | shares |  |  |  |  |  | 0.3 |  | 2.4 |  |
Purchases of registered shares |  |  |  |  |  | $ 10,682,000 |  | $ 42,894,000 |  |
Cash dividend paid per share (in dollars per share) | (per share) |  | $ 0.63 | SFr 0.61 | $ 0.57 | SFr 0.56 | $ 0.63 | SFr 0.61 | $ 0.57 | SFr 0.56 |
Cash dividend declared per share (in dollars per share) | (per share) |  | $ 0.63 | SFr 0.61 | $ 0.57 | SFr 0.56 | $ 0.63 | SFr 0.61 | $ 0.57 | SFr 0.56 |
Dividends paid |  | $ (104,200,000) |  | $ (93,100,000) |  | $ (104,200,000) |  | $ (93,100,000) |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: 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 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: 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 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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