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Information about Fund Investments Company and its Subsidiaries Hold under ASC 820 (Detail) (JPY ¥) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Dec. 31, 2011		Mar. 31, 2011
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fund investments	¥ 5,239		¥ 10,023
Redemption Frequency (If Currently Eligible)	-		-
Redemption Notice Period	-		-
Hedge Fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fund investments	¥ 5,239	[1]	¥ 10,023	[1]
Redemption Frequency (If Currently Eligible)	Monthly - Quarterly	[1]	Monthly - Quarterly	[1]
Redemption Notice Period	10 days - 45 days	[1]	10 days - 45 days	[1]
[1] This category includes several hedge funds that seek profits using investment strategies such as managed futures, global macro and relative value. The fair value of the investments in this category is calculated based on the net asset value of the investees.

X

- Definition

This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value.

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No definition available.

+ Details

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Namespace Prefix:	ix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

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No definition available.

+ Details

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

X

- Definition

States the notice requirement (for example, 30 to 60 days) the entity is required to deliver before it can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

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No definition available.

+ Details

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

X

- Details

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