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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