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Geographical Revenues and Income Before Income Taxes (Detail) In Millions | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Japan USD ($) | Mar. 31, 2011 Japan JPY (¥) | Mar. 31, 2010 Japan JPY (¥) | Mar. 31, 2009 Japan JPY (¥) | Mar. 31, 2011 Americas USD ($) | Mar. 31, 2011 Americas JPY (¥) | Mar. 31, 2010 Americas JPY (¥) | Mar. 31, 2009 Americas JPY (¥) | Mar. 31, 2011 Other Countries USD ($) | Mar. 31, 2011 Other Countries JPY (¥) | Mar. 31, 2010 Other Countries JPY (¥) | Mar. 31, 2009 Other Countries JPY (¥) | Mar. 31, 2011 Difference between Geographic Total and Consolidated Amounts USD ($) | Mar. 31, 2011 Difference between Geographic Total and Consolidated Amounts JPY (¥) | Mar. 31, 2010 Difference between Geographic Total and Consolidated Amounts JPY (¥) | Mar. 31, 2009 Difference between Geographic Total and Consolidated Amounts JPY (¥)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 11,667 | ¥ 970,110 | ¥ 912,294 | ¥ 1,032,486 | $ 9,277 | ¥ 771,403 | ¥ 784,537 | ¥ 933,951 | $ 1,671 | [1] | ¥ 138,975 | [1] | ¥ 96,879 | [1] | ¥ 68,026 | [1] | $ 995 | [2] | ¥ 82,772 | [2] | ¥ 81,919 | [2] | ¥ 95,265 | [2] | $ (276) | ¥ (23,040) | ¥ (51,041) | ¥ (64,756)
Income before income Taxes | $ 1,106 | ¥ 91,965 | ¥ 54,593 | ¥ 12,035 | $ 751 | ¥ 62,477 | ¥ 33,180 | ¥ 8,695 | $ 221 | [1] | ¥ 18,411 | [1] | ¥ 18,743 | [1] | ¥ 3,191 | [1] | $ 297 | [2] | ¥ 24,633 | [2] | ¥ 17,123 | [2] | ¥ 18,032 | [2] | $ (163) | ¥ (13,556) | ¥ (14,453) | ¥ (17,883)
[1] | Mainly United States
[2] | Mainly Asia, Europe, Oceania and Middle East

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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