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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)	3 Months Ended				6 Months Ended
	Sep. 30, 2020 $ / shares	Sep. 30, 2020 SFr / shares	Sep. 30, 2019 $ / shares	Sep. 30, 2019 SFr / shares	Sep. 30, 2020 $ / shares	Sep. 30, 2020 SFr / shares	Sep. 30, 2019 $ / shares	Sep. 30, 2019 SFr / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share) | (per share)	$ 0.87	SFr 0.79	$ 0.74	SFr 0.73	$ 0.87	SFr 0.79	$ 0.74	SFr 0.73

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- 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)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration