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Details of Credit Derivatives Written (Detail) (Credit default swap, JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Credit default swap
    
Credit Derivatives [Line Items]    
The events or circumstances that would require the seller to perform under the credit derivative In case of credit event (bankruptcy, failure to pay, restructuring) occurring in underlying reference company [1] In case of credit event (bankruptcy, failure to pay, restructuring) occurring in underlying reference company [2]
Maximum potential amount of future payment under the credit derivative ¥ 425 ¥ 832
Approximate remaining term of the credit derivative 4 years 5 years
Fair value of the credit derivative ¥ 29 ¥ (29)
[1] Underlying reference company's credit ratings are Baa1 or better rated by rating agencies as of March 31, 2014.
[2] Underlying reference company's credit ratings are Caa1 or better rated by rating agencies as of March 31, 2013.