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Quantitative Information About Delinquencies, Net Credit Losses, and Components of Financial Assets Sold on Securitization and Other Assets Managed Together (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Principal amount of assets managed or sold on securitization receivables ¥ 3,409,628 ¥ 3,680,551  
Direct financing leases sold on securitization 1,156 1,698  
Principal amount of assets managed or sold on securitization receivables 3,410,784 3,682,249  
Principal amount of assets managed or sold on securitization receivables more than 90 days past-due and impaired loans 155,860 236,291  
Direct financing lease sold on securitization 0 0  
Principal amount of assets managed or sold on securitization receivables more than 90 days past-due and impaired loans 155,860 236,291  
Assets recorded on the balance sheet credit losses 28,112 43,188 36,259
Direct financing lease sold on securitization credit losses 0 0 0
Assets managed or sold on securitization net credit losses 28,112 43,188 36,259
Direct Financing Leases
      
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Principal amount of assets managed or sold on securitization receivables 1,094,073 989,380  
Principal amount of assets managed or sold on securitization receivables more than 90 days past-due and impaired loans 13,887 15,806  
Assets recorded on the balance sheet credit losses 4,351 4,046 6,783
Installment Loans
      
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Principal amount of assets managed or sold on securitization receivables 2,315,555 2,691,171  
Principal amount of assets managed or sold on securitization receivables more than 90 days past-due and impaired loans 141,973 220,485  
Assets recorded on the balance sheet credit losses ¥ 23,761 ¥ 39,142 ¥ 29,476