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v2.3.0.11

Reconciliation for Level 3 Plan Assets (Detail) In Millions | 12 Months Ended |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Level 3 USD ($) | Mar. 31, 2011 Level 3 JPY (¥) | Mar. 31, 2010 Level 3 JPY (¥) | Mar. 31, 2011 Level 3 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2011 Level 3 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2010 Level 3 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2011 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2011 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2010 Alternative Investments Pooled Funds JPY (¥)
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 1,033 | ¥ 85,967 | ¥ 74,111 | $ 60 | ¥ 4,948 | ¥ 4,728 | $ 57 | [1] | ¥ 4,728 | [1] | ¥ 3,514 |  | $ 140 | [1] | ¥ 11,633 | [1] | ¥ 11,122 | [1]
Realized and unrealized return on plan assets | (5) | (449) | 9,382 |  |  |  | 3 |  | 220 |  | 453 |  |  |  |  |  |  |
Purchases, sales and redemptions, net |  |  |  |  |  |  | 0 |  | 0 |  | 761 |  |  |  |  |  |  |
Ending Balance | $ 1,027 | ¥ 85,396 | ¥ 85,967 | $ 60 | ¥ 4,948 | ¥ 4,728 | $ 60 | [1] | ¥ 4,948 | [1] | ¥ 4,728 | [1] | $ 140 | [1] | ¥ 11,633 | [1] | ¥ 11,122 | [1]
[1] | These funds invest in hedge funds as alternative investments.

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 + Details
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- Definition Purchases, sales, and settlements of plan assets that occurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(ii) + Details
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