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Fair Value Measurements - Additional Information (Detail) (Corporate debt securities, JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
Corporate debt securities
Fair Value Assets Liabilities Measured On Recurring Basis [Line Items]
Corporate debt securities transferred from Level 2 to Level 3	¥ 468

X

- Details

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Namespace Prefix:	ix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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