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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 (¥)
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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

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + Details
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Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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