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Variable Interest Entities - Additional Information (Detail) (JPY ¥)	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Additional fund contributed to certain non-consolidated VIEs to support their repayment	¥ 135,000,000	¥ 14,613,000,000
Accounting Standards Update 2009-16 And 2009-17
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

X

- Definition

Increase Decrease In Variable Interest Entity Consolidated Carrying Amount Assets

+ References

No definition available.

+ Details

Name:	ix_IncreaseDecreaseInVariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	ix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase Decrease In Variable Interest Entity Consolidated Carrying Amount Liabilities

+ References

No definition available.

+ Details

Name:	ix_IncreaseDecreaseInVariableInterestEntityConsolidatedCarryingAmountLiabilities
Namespace Prefix:	ix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

Name:	ix_VariableInterestEntityFinancialOrOtherSupportAmount
Namespace Prefix:	ix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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