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Securitization Transaction Accounted for as Sales (Detail) (JPY ¥) In Millions	12 Months Ended
	Mar. 31, 2010	Mar. 31, 2009
Direct financing leases
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Balance sold	¥ 27,974	¥ 37,889
Gains (losses) on sales	331	(365)
Interests that continue to be held	23,207	17,903
Installment Loans
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Balance sold	0	5,258
Gains (losses) on sales	0	132
Interests that continue to be held	¥ 0	¥ 148

X

- Definition

Securitization Financial Asset For Which Transfer Is Accounted As Sale Assets Sold

+ Details

Name:	ix_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleAssetsSold
Namespace Prefix:	ix
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The carrying amount (fair value) as of the balance sheet date of interests in financial instruments (typically securitized receivables) that continue to be held (which are generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4 and FIN46(R)-8
-Paragraph B11
-Subparagraph b(5)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph i

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reflects by transferred financial asset type the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs. The transferor surrenders control of all or a portion of the financial assets and receives consideration other than a beneficial interest in the assets transferred

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4 and FIN46(R)-8
-Paragraph B11
-Subparagraph a(2)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph h(2)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration