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Information about Fund Investments Company and its Subsidiaries Hold under ASC 820 (Detail) In Millions | 12 Months Ended |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Hedge Fund USD ($) | Mar. 31, 2011 Hedge Fund JPY (¥) | Mar. 31, 2010 Hedge Fund JPY (¥)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Fund investments | $ 121 | ¥ 10,023 | ¥ 14,692 | $ 121 | [1] | ¥ 10,023 | [1] | ¥ 14,692 | [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. + Details
Name: | ix_AlternativeInvestmentsFairValueDisclosure
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. + 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. + Details
Name: | ix_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionNoticePeriod
Namespace Prefix: | ix
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] + Details
Name: | ix_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems
Namespace Prefix: | ix
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration