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Balance of Allowance Broken Down into Investment in Direct Financing Leases and Installment Loans (Detail) In Millions	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2011 Direct financing leases JPY (¥)	Mar. 31, 2011 Direct financing leases USD ($)	Mar. 31, 2010 Direct financing leases JPY (¥)	Mar. 31, 2011 Installment Loans JPY (¥)	Mar. 31, 2011 Installment Loans USD ($)	Mar. 31, 2010 Installment Loans JPY (¥)
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance of allowance	$ 1,854	¥ 154,150	¥ 157,523	¥ 21,201	$ 255	¥ 23,969	¥ 132,949	$ 1,599	¥ 133,554

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ Details

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Balance Type:	credit
Period Type:	instant

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

Name:	ix_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	ix
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration