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Cash Flows Received from or Paid to SPEs for All Securitization Activities (Detail) (JPY ¥) In Millions | 12 Months Ended
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Mar. 31, 2010 | Mar. 31, 2009
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] |  |
Proceeds from new securitizations | ¥ 28,305 | ¥ 42,922
Servicing fees received | 385 | 419
Cash flows received on interests that continue to be held | 29,336 | 23,740
Repurchases of ineligible assets | ¥ (18,487) | ¥ (20,219)

X
- Definition This amount represents total cash flows received from retained interests by the transferor other than servicing fees. Other cash flows include, for example, all cash flows from interest-only strips and cash above the minimum required level in cash collateral accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph B11 -Subparagraph a(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph h(4) + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of proceeds from new securitizations or asset-backed financing arrangements during this reporting period for this class of securitization or asset-backed financing arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph B11 -Subparagraph a(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph h(4) + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of cash outflow used to purchase previously transferred financial assets (or its underlying collateral), including delinquent or foreclosed assets, from the securitization or asset-backed financing arrangement SPE. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph B11 -Subparagraph a(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph h(4) + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of servicing fees from the securitization or asset-backed financing arrangement SPE. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph B11 -Subparagraph a(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph h(4) + Details
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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
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Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration