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Information about Allowance for Credit Losses (Parenthetical) (Detail) (Non-recourse Loans, JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014
Non-recourse Loans |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Decreases non-recourse loans | ¥ (6,562)

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the reporting period in outstanding loans including accrued interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInFinanceReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration