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Stock-Based Compensation - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Jul. 31, 2009 | Mar. 31, 2011 Stock Options Fiscal 2002 Plan | Mar. 31, 2011 Minimum Stock Options Year | Mar. 31, 2011 Maximum Stock Options Year | Mar. 31, 2011 Stock Options USD ($) | Mar. 31, 2011 Stock Options JPY (¥) | Mar. 31, 2010 Stock Options JPY (¥) | Mar. 31, 2009 Stock Options JPY (¥) | Mar. 31, 2011 Stock Compensation Plan USD ($) Point | Mar. 31, 2011 Stock Compensation Plan JPY (¥) | Mar. 31, 2010 Stock Compensation Plan JPY (¥) | Mar. 31, 2009 Stock Compensation Plan JPY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock vesting period |  | 2 years |  |  |  |  |  |  |  |  |  |
Stock exercise period |  | 10 years |  |  |  |  |  |  |  |  |  |
Stock granted for purchase | 18,000,000 | 300,900 |  |  |  |  |  |  |  |  |  |
Weighted average vesting period |  |  | 1.67 | 1.92 |  |  |  |  |  |  |  |
Weighted average exercise period |  |  | 9.67 | 9.92 |  |  |  |  |  |  |  |
Cash received from the exercise of stock options |  |  |  |  | $ 1 | ¥ 98 | ¥ 77 | ¥ 245 |  |  |  |
Total intrinsic value of options exercised |  |  |  |  | 0 | 19 | 6 | 202 |  |  |  |
Incremental stock-based compensation costs recognized |  |  |  |  | $ 2 | ¥ 142 | ¥ 611 | ¥ 1,370 | $ 3 | ¥ 255 | ¥ 355 | ¥ 356
Points granted |  |  |  |  |  |  |  |  | 38,700 | 38,700 |  |
Points settled for individuals retired |  |  |  |  |  |  |  |  | 8,975 | 8,975 |  |
Points outstanding |  |  |  |  |  |  |  |  | 123,008 | 123,008 |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a + Details
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- Definition Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a + Details
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- Definition Share-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) + Details
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- Definition The quantity of shares issuable on stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) + Details
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