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Installment Loans - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on loans ¥ 118,287 ¥ 144,458 ¥ 132,719
Loans held for sale in installment loans 14,267 17,939  
Loans held for sale measured at fair value 12,631 16,026  
Installment Loans 2,315,555 2,691,171  
Purchased loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Installment Loans 53,341 [1] 70,801 [1]  
Fair value at the acquisition date of purchased loans acquired during the period 4,742 5,672  
Purchased loans | Class Of Financing Receivable
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchased loans for which valuation allowances were provided ¥ 23,075 ¥ 29,107  
[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").