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Shareholders' Equity - Narrative (Details)	1 Months Ended	3 Months Ended				6 Months Ended
	Mar. 31, 2017 USD ($) shares	Sep. 30, 2019 SFr / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 SFr / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2019 SFr / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 SFr / shares	Sep. 30, 2018 USD ($) $ / shares
Stockholders' Equity Note [Abstract]
Authorized amount in buyback program | $	$ 250,000,000.0
Shares authorized to be repurchased (in shares) | shares	17,300,000
Period to complete share repurchase program	3 years
Remaining number of shares authorized to be repurchased (in shares) | shares		172,400,000	172,400,000			172,400,000	172,400,000
Cash dividends per share (in dollars/CHF per share) | (per share)		SFr 0.73	$ 0.74	SFr 0.67	$ 0.69	SFr 0.73	$ 0.74	SFr 0.67	$ 0.69
Payment of cash dividends | $			$ 124,200,000		$ 114,000,000.0		$ 124,180,000		$ 113,971,000

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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-Topic 230
-SubTopic 10
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Amount of stock repurchase plan authorized.

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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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