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Brokerage Commissions and Net Gains on Investment Securities - Additional Information (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Derivative USD ($) | Mar. 31, 2011 Derivative JPY (¥) | Mar. 31, 2010 Derivative JPY (¥) | Mar. 31, 2009 Derivative JPY (¥)
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |
Net trading gains (losses) | $ 55 | ¥ 4,607 | ¥ 8,762 | ¥ (13,143) | $ 24 | ¥ 1,977 | ¥ (239) | ¥ 3,874

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- Definition This item represents the gain or loss realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 + Details
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