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Summary of Information about Stock Options Activity (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Mar. 31, 2011 USD ($) Year Investment | Mar. 31, 2011 JPY (¥)
Number of shares |  |  |  |
Outstanding at beginning of the year | 1,370,380 |  | 1,370,380 |
Exercised | (14,000) |  | (14,000) |
Forfeited or expired | (134,020) |  | (134,020) |
Outstanding at end of year | 1,222,360 |  | 1,222,360 |
Exercisable at end of year | 1,222,360 |  | 1,222,360 |
Weighted average exercise price |  |  |  |
Outstanding at beginning of the year | $ 219.62 | [1] | ¥ 18,261.00 | [1]
Exercised | $ 85.94 | [1] | ¥ 7,146.00 | [1]
Forfeited or expired | $ 208.15 | [1] | ¥ 17,308.00 | [1]
Outstanding at end of year | $ 222.41 | [1] | ¥ 18,493.00 | [1]
Exercisable at end of year | $ 222.41 | [1] | ¥ 18,493.00 | [1]
Aggregate intrinsic value |  |  |  |
Outstanding at end of year | $ 0 |  | ¥ 0 |
Exercisable at end of year | $ 0 |  | ¥ 0 |
Weighted average remaining contractual life |  |  |  |
Outstanding at end of year | 4.26 |  | 4.26 |
Exercisable at end of year | 4.26 |  | 4.26 |
[1] | The exercise prices of the granted options were adjusted in July 2009 for the issuance of new 18 million shares.

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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance-sheet date. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option 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 b(1)(c), d(2) + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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 b(1)(c) + Details
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- Definition The weighted average period between the balance-sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years. + Details
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- Definition The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option 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 b(1)(e) + Details
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- Definition The weighted average price at which option holders acquired shares when converting their stock options into shares 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)(e) + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. + 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)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) + Details
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- Definition The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option 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 b(1)(a) + Details
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