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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)	1 Months Ended						12 Months Ended
	Sep. 30, 2018 $ / shares	Sep. 30, 2018 SFr / shares	Sep. 30, 2017 $ / shares	Sep. 30, 2017 SFr / shares	Sep. 30, 2016 $ / shares	Sep. 30, 2016 SFr / shares	Mar. 31, 2019 $ / shares	Mar. 31, 2018 $ / shares	Mar. 31, 2017 $ / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars) | (per share)	$ 0.69	SFr 0.67	$ 0.63	SFr 0.61	$ 0.57	SFr 0.56	$ 690.00	$ 630.00	$ 570.00

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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=27012166&loc=d3e187085-122770

+ 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