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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)	3 Months Ended				6 Months Ended
	Sep. 30, 2025 $ / shares	Sep. 30, 2025 SFr / shares	Sep. 30, 2024 $ / shares	Sep. 30, 2024 SFr / shares	Sep. 30, 2025 $ / shares	Sep. 30, 2025 SFr / shares	Sep. 30, 2024 $ / shares	Sep. 30, 2024 SFr / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share) | (per share)	$ 1.58	SFr 1.26	$ 1.37	SFr 1.16	$ 1.58	SFr 1.26	$ 1.37	SFr 1.16

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration