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Summary of Information Related to Stock Acquisition Rights (Detail) (JPY ¥) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2009 | Mar. 31, 2014 Stock Options Fiscal 2004 Plan | Mar. 31, 2014 Stock Options Fiscal 2005 Plan | Mar. 31, 2014 Stock Options Fiscal 2006 Plan | Mar. 31, 2014 Stock Options Fiscal 2007 Plan | Mar. 31, 2014 Stock Options Fiscal 2008 Plan | Mar. 31, 2014 Stock Options Fiscal 2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise period, range start |  | Jun. 26, 2005 | Jun. 24, 2006 | Jun. 22, 2007 | Jun. 21, 2008 | Jul. 05, 2009 | Jul. 18, 2010
Exercise period, range end |  | Jun. 25, 2013 | Jun. 23, 2014 | Jun. 21, 2015 | Jun. 20, 2016 | Jun. 22, 2017 | Jun. 24, 2018
Number of shares Initially granted | 18,000,000 | 5,160,000 | 5,289,000 | 4,774,000 | 1,942,000 | 1,449,800 | 1,479,000
Exercise Price |  | ¥ 700 | ¥ 1,172 | ¥ 1,891 | ¥ 2,962 | ¥ 3,101 | ¥ 1,689

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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