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Stock-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2011
Schedule of Stockholders' Equity Note, Warrants or Rights | A summary of information related to the Company’s stock acquisition rights is as follows:
Years ended March 31, |  | Exercise period |  | Number of shares Initially granted |  |  | Exercise price |
|  |  | Yen |  |  | U.S. dollars |
2003 |  | From June 27, 2004 to June 26, 2012 |  |  | 453,300 |  |  | ¥ | 7,206 |  |  | $ | 87 |
2004 |  | From June 26, 2005 to June 25, 2013 |  |  | 516,000 |  |  |  | 6,991 |  |  |  | 84 |
2005 |  | From June 24, 2006 to June 23, 2014 |  |  | 528,900 |  |  |  | 11,720 |  |  |  | 141 |
2006 |  | From June 22, 2007 to June 21, 2015 |  |  | 477,400 |  |  |  | 18,903 |  |  |  | 227 |
2007 |  | From June 21, 2008 to June 20, 2016 |  |  | 194,200 |  |  |  | 29,611 |  |  |  | 356 |
2008 |  | From July 5, 2009 to June 22, 2017 |  |  | 144,980 |  |  |  | 31,009 |  |  |  | 373 |
2009 |  | From July 18, 2010 to June 24, 2018 |  |  | 147,900 |  |  |  | 16,888 |  |  |  | 203
Employee Stock Options Activity | The following table summarizes information about the activity of these stock options for the year ended 2011:
|  | Number of shares |  |  | Weighted average exercise price (*) |  |  | Weighted average remaining contractual life |  |  | Aggregate intrinsic value |
|  | Yen |  |  | U.S. dollar |  |  | Years |  |  | Millions of yen |  |  | Millions of U.S. dollar |
Outstanding at beginning of the year |  |  | 1,370,380 |  |  | ¥ | 18,261 |  |  | $ | 219.62 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (14,000 | ) |  |  | 7,146 |  |  |  | 85.94 |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (134,020 | ) |  |  | 17,308 |  |  |  | 208.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of year |  |  | 1,222,360 |  |  |  | 18,493 |  |  |  | 222.41 |  |  |  | 4.26 |  |  | ¥ | 0 |  |  | $ | 0 |
Exercisable at end of year |  |  | 1,222,360 |  |  | ¥ | 18,493 |  |  | $ | 222.41 |  |  |  | 4.26 |  |  | ¥ | 0 |  |  | $ | 0 |
* | The exercise prices of the granted options were adjusted in July 2009 for the issuance of new 18 million shares.
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used | The fair value of each option was estimated on the date of grant under the following assumptions with the binominal option-pricing model. As for fiscal 2010 and 2011, the fair value of options was not estimated because no stock options were granted.
|  | 2009 |
Weighted-average grant-date fair value |  | ¥ | 5,630 |
Risk-free rate |  |  | 0.60-1.52 | %
Expected volatility |  |  | 46.00 | %
Expected dividend yield |  |  | 1.73 | %

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- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset (or liability) could be bought (or incurred) or sold (or settled) in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + Details
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- Definition Disclosure for warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-98 -Paragraph 2 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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