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Securitization Transactions - Additional Information (Detail) (JPY ¥)
In Millions, unless otherwise specified
9 Months Ended
Dec. 31, 2011
Mar. 31, 2011
Servicing Assets at Amortized Value [Line Items]    
Servicing assets ¥ 10,877 ¥ 11,577
Increase in servicing assets 1,892  
Amortization of servicing assets 1,834  
Foreign currency translation effects on servicing assets 758  
Fair value of servicing assets ¥ 12,635 ¥ 14,093