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Fair Value of Pension Plan Assets by Asset Category (Parenthetical) (Detail) (JPY ¥) In Millions, unless otherwise specified							12 Months Ended						12 Months Ended						12 Months Ended
	Mar. 31, 2014 Overseas Pension Plans Defined Benefit	Mar. 31, 2013 Overseas Pension Plans Defined Benefit	Mar. 31, 2012 Overseas Pension Plans Defined Benefit	Mar. 31, 2014 Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2013 Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2012 Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2013 Japanese Government Bond Securities Overseas Pension Plans Defined Benefit	Mar. 31, 2014 Japanese Government Bond Securities Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2013 Japanese Municipal Bonds Securities Overseas Pension Plans Defined Benefit	Mar. 31, 2014 Japanese Municipal Bonds Securities Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2013 Japanese Corporate Bonds Securities Overseas Pension Plans Defined Benefit	Mar. 31, 2013 Japanese Corporate Bonds Securities Overseas Pension Plans Defined Benefit ORIX JREIT Inc.	Mar. 31, 2014 Japanese Corporate Bonds Securities Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2014 Japanese Corporate Bonds Securities Domestic Pension Plans Of Foreign Entity Defined Benefit ORIX JREIT Inc.	Mar. 31, 2013 Japanese Companies Equity Securities Overseas Pension Plans Defined Benefit	Mar. 31, 2013 Japanese Companies Equity Securities Overseas Pension Plans Defined Benefit ORIX JREIT Inc.	Mar. 31, 2014 Japanese Companies Equity Securities Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2014 Japanese Companies Equity Securities Domestic Pension Plans Of Foreign Entity Defined Benefit ORIX JREIT Inc.	Mar. 31, 2013 Foreign Government Bonds Domestic Pension Plans Of Foreign Entity Defined Benefit	Mar. 31, 2013 Debt Securities Domestic Pension Plans Of Foreign Entity Defined Benefit
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of pension plan assets	¥ 62,042	¥ 3,825	¥ 3,040	¥ 104,984	¥ 93,144	¥ 82,905					¥ 107	¥ 41	¥ 46	¥ 20	¥ 12	¥ 179	¥ 25	¥ 181
Pension plan assets investment allocation in pooled funds							70.00%	70.00%	10.00%	10.00%	20.00%		20.00%						90.00%	10.00%

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

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-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 5

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-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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