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Summary of Information Related to Company's Stock Acquisition Rights (Detail) | 1 Months Ended | 12 Months Ended
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Jul. 31, 2009 | Mar. 31, 2011 Stock Options Fiscal 2003 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2003 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2004 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2004 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2005 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2005 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2006 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2006 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2007 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2007 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2008 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2008 Plan JPY (¥) | Mar. 31, 2011 Stock Options Fiscal 2009 Plan USD ($) | Mar. 31, 2011 Stock Options Fiscal 2009 Plan JPY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise period |  | From June 27, 2004 to June 26, 2012 | From June 27, 2004 to June 26, 2012 | From June 26, 2005 to June 25, 2013 | From June 26, 2005 to June 25, 2013 | From June 24, 2006 to June 23, 2014 | From June 24, 2006 to June 23, 2014 | From June 22, 2007 to June 21, 2015 | From June 22, 2007 to June 21, 2015 | From June 21, 2008 to June 20, 2016 | From June 21, 2008 to June 20, 2016 | From July 5, 2009 to June 22, 2017 | From July 5, 2009 to June 22, 2017 | From July 18, 2010 to June 24, 2018 | From July 18, 2010 to June 24, 2018
Number of shares Initially granted | 18,000,000 | 453,300 | 453,300 | 516,000 | 516,000 | 528,900 | 528,900 | 477,400 | 477,400 | 194,200 | 194,200 | 144,980 | 144,980 | 147,900 | 147,900
Exercise Price |  | $ 87 | ¥ 7,206 | $ 84 | ¥ 6,991 | $ 141 | ¥ 11,720 | $ 227 | ¥ 18,903 | $ 356 | ¥ 29,611 | $ 373 | ¥ 31,009 | $ 203 | ¥ 16,888

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- Definition The quantity of shares issuable on stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) + Details
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