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Variable Interest Entities - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2010 Accounting Standards Update 2009-16 And 2009-17 JPY (¥) | Mar. 31, 2011 Variable Interest Entity, Not Primary Beneficiary USD ($) | Mar. 31, 2011 Variable Interest Entity, Not Primary Beneficiary JPY (¥) | Mar. 31, 2010 Variable Interest Entity, Not Primary Beneficiary JPY (¥)
Variable Interest Entity [Line Items] |  |  |  |
Increase in total assets due to adoption of accounting standards update | ¥ 1,147,000,000,000 |  |  |
Increase in total liabilities due to adoption of accounting standards update | 1,169,000,000,000 |  |  |
Additional fund contributed to certain non-consolidated VIEs to support their repayment |  | $ 176,000,000 | ¥ 14,613,000,000 | ¥ 5,148,000,000

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- Definition Increase Decrease In Variable Interest Entity Consolidated Carrying Amount Assets + Details
Name: | ix_IncreaseDecreaseInVariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase Decrease In Variable Interest Entity Consolidated Carrying Amount Liabilities + Details
Name: | ix_IncreaseDecreaseInVariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support. + Details
Name: | ix_VariableInterestEntityFinancialOrOtherSupportAmount
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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