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Information about Allowance for Credit Losses (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Consumer Loan USD ($) | Mar. 31, 2011 Consumer Loan JPY (¥) | Mar. 31, 2011 Corporate Non-recourse loans JPY (¥) | Mar. 31, 2011 Corporate Non-recourse loans USD ($) | Mar. 31, 2011 Corporate Other loans USD ($) | Mar. 31, 2011 Corporate Other loans JPY (¥) | Mar. 31, 2011 Purchased loans JPY (¥) | Mar. 31, 2011 Purchased loans USD ($) | Mar. 31, 2011 Direct financing leases USD ($) | Mar. 31, 2011 Direct financing leases JPY (¥)
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Credit Losses, Ending Balance | $ 1,854 | ¥ 154,150 | ¥ 157,523 | $ 206 | ¥ 17,096 | ¥ 27,426 | $ 329 | $ 854 | ¥ 70,972 | ¥ 17,455 | [1] | $ 210 | [1] | $ 255 | ¥ 21,201
Allowance for Credit Losses, Individually Evaluated for Impairment | 1,170 | 97,323 |  | 36 | 3,016 | 23,123 | 278 | 663 | 55,170 | 16,014 | [1] | 193 | [1] | 0 | 0
Allowance for Credit Losses, Not Individually Evaluated for Impairment | 684 | 56,827 |  | 170 | 14,080 | 4,303 | 51 | 191 | 15,802 | 1,441 | [1] | 17 | [1] | 255 | 21,201
Financing receivables, Ending Balance | 45,704 | 3,800,299 |  | 10,108 | 840,419 | 952,573 | 11,456 | 12,809 | 1,065,119 | 111,335 | [1] | 1,339 | [1] | 9,992 | 830,853
Financing receivables, Individually Evaluated for Impairment | 3,753 | 312,031 | 348,143 | 100 | 8,312 | 73,029 | 879 | 2,333 | 194,005 | 36,685 | [1] | 441 | [1] | 0 | 0
Financing receivables, Not Individually Evaluated for Impairment | $ 41,951 | ¥ 3,488,268 |  | $ 10,008 | ¥ 832,107 | ¥ 879,544 | $ 10,577 | $ 10,476 | ¥ 871,114 | ¥ 74,650 | [1] | $ 898 | [1] | $ 9,992 | ¥ 830,853
[1] | Purchased loans represent loans with evidence of deterioration of credit quality since origination and for which it is probable at acquisition that collection of all contractually required payments from the debtors is unlikely in accordance with ASC 310-30 ("Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality").

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- Definition A contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, accounts receivable (with terms exceeding one year), notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. + Details
Name: | ix_FinancingReceivable
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + Details
Name: | ix_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + Details
Name: | ix_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + Details
Name: | ix_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The balance of financing receivables that were individually evaluated for impairment. + Details
Name: | ix_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant