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Summary of Information about Stock Options Activity (Detail) (JPY ¥)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Number of shares  
Outstanding at beginning of the year 9,051,000 [1]
Exercised (804,300) [1]
Forfeited or expired (430,200) [1]
Outstanding at end of year 7,816,500 [1]
Exercisable at end of year 7,816,500 [1]
Weighted average exercise price  
Outstanding at beginning of the year ¥ 2,011 [1],[2]
Exercised ¥ 1,077 [1],[2]
Forfeited or expired ¥ 1,846 [1],[2]
Outstanding at end of year ¥ 2,117 [1],[2]
Exercisable at end of year ¥ 2,117 [1],[2]
Weighted average remaining contractual life  
Outstanding at end of year 1 year 11 months 19 days
Exercisable at end of year 1 year 11 months 19 days
Aggregate intrinsic value  
Outstanding at end of year ¥ 327
Exercisable at end of year ¥ 327
[1] The number of shares and exercise price of the granted options were adjusted for the 10-for-1 stock split implemented on April 1, 2013.
[2] The exercise prices of the granted options were adjusted in July 2009 for the issuance of new 18 million shares.