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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.

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