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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)
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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

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