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Changes in Number of Shares Issued (Detail)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Stockholders Equity Note [Line Items]      
Exercise of stock options 804,300 [1]    
Common Stock
      
Stockholders Equity Note [Line Items]      
Beginning balance 1,248,714,760 1,102,544,220 1,102,458,460
Exercise of stock options 804,300 499,000 77,000
Conversion of convertible bonds 73,258,568 145,671,540 8,760
Ending balance 1,322,777,628 1,248,714,760 1,102,544,220
[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.