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Brokerage Commissions and Net Gains (Losses) on Investment Securities (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Net Investment Income [Line Items]      
Net gains on investment securities ¥ 19,412 ¥ 28,805 ¥ 24,894
Dividends income, other 7,771 6,009 4,443
Brokerage commissions and net gains on investment securities ¥ 27,183 ¥ 34,814 ¥ 29,337