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Fair Value of Pension Plan Assets by Asset Category (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 USD ($) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Level 1 USD ($) | Mar. 31, 2011 Level 1 JPY (¥) | Mar. 31, 2010 Level 1 JPY (¥) | Mar. 31, 2011 Level 1 Japan Japanese Companies Equity Securities USD ($) | Mar. 31, 2011 Level 1 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2010 Level 1 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2011 Level 1 Japan Pooled Equity Securities Funds USD ($) | Mar. 31, 2010 Level 1 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 1 Japan Pooled Debt Securities Funds USD ($) | Mar. 31, 2010 Level 1 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 1 Overseas Pooled Equity Securities Funds USD ($) | Mar. 31, 2010 Level 1 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 1 Overseas Pooled Debt Securities Funds USD ($) | Mar. 31, 2010 Level 1 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 1 Overseas Asset-backed Securities USD ($) | Mar. 31, 2010 Level 1 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2011 Level 1 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2010 Level 1 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2011 Level 1 Other Assets Life Insurance Company General Accounts USD ($) | Mar. 31, 2010 Level 1 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2011 Level 1 Other Assets Other USD ($) | Mar. 31, 2010 Level 1 Other Assets Other JPY (¥) | Mar. 31, 2011 Level 2 USD ($) | Mar. 31, 2011 Level 2 JPY (¥) | Mar. 31, 2010 Level 2 JPY (¥) | Mar. 31, 2011 Level 2 Japan Japanese Companies Equity Securities USD ($) | Mar. 31, 2010 Level 2 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2011 Level 2 Japan Pooled Equity Securities Funds USD ($) | Mar. 31, 2011 Level 2 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2010 Level 2 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 2 Japan Pooled Debt Securities Funds USD ($) | Mar. 31, 2011 Level 2 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2010 Level 2 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 2 Overseas Pooled Equity Securities Funds USD ($) | Mar. 31, 2011 Level 2 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2010 Level 2 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 2 Overseas Pooled Debt Securities Funds USD ($) | Mar. 31, 2011 Level 2 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2010 Level 2 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 2 Overseas Asset-backed Securities USD ($) | Mar. 31, 2011 Level 2 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2010 Level 2 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2011 Level 2 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2011 Level 2 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2010 Level 2 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2011 Level 2 Other Assets Life Insurance Company General Accounts USD ($) | Mar. 31, 2011 Level 2 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2010 Level 2 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2011 Level 2 Other Assets Other USD ($) | Mar. 31, 2011 Level 2 Other Assets Other JPY (¥) | Mar. 31, 2010 Level 2 Other Assets Other JPY (¥) | Mar. 31, 2011 Level 3 USD ($) | Mar. 31, 2011 Level 3 JPY (¥) | Mar. 31, 2010 Level 3 JPY (¥) | Mar. 31, 2011 Level 3 Japan Japanese Companies Equity Securities USD ($) | Mar. 31, 2010 Level 3 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2011 Level 3 Japan Pooled Equity Securities Funds USD ($) | Mar. 31, 2010 Level 3 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 3 Japan Pooled Debt Securities Funds USD ($) | Mar. 31, 2010 Level 3 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 3 Overseas Pooled Equity Securities Funds USD ($) | Mar. 31, 2010 Level 3 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Level 3 Overseas Pooled Debt Securities Funds USD ($) | Mar. 31, 2010 Level 3 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Level 3 Overseas Asset-backed Securities USD ($) | Mar. 31, 2010 Level 3 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2011 Level 3 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2011 Level 3 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2010 Level 3 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2010 Level 3 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2009 Level 3 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2011 Level 3 Other Assets Life Insurance Company General Accounts USD ($) | Mar. 31, 2010 Level 3 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2011 Level 3 Other Assets Other USD ($) | Mar. 31, 2010 Level 3 Other Assets Other JPY (¥) | Mar. 31, 2011 Japan Japanese Companies Equity Securities USD ($) | Mar. 31, 2011 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2010 Japan Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2011 Japan Pooled Equity Securities Funds USD ($) | Mar. 31, 2011 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2010 Japan Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Japan Pooled Debt Securities Funds USD ($) | Mar. 31, 2011 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2010 Japan Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Overseas Pooled Equity Securities Funds USD ($) | Mar. 31, 2011 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2010 Overseas Pooled Equity Securities Funds JPY (¥) | Mar. 31, 2011 Overseas Pooled Debt Securities Funds USD ($) | Mar. 31, 2011 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2010 Overseas Pooled Debt Securities Funds JPY (¥) | Mar. 31, 2011 Overseas Asset-backed Securities USD ($) | Mar. 31, 2011 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2010 Overseas Asset-backed Securities JPY (¥) | Mar. 31, 2011 Alternative Investments Pooled Funds USD ($) | Mar. 31, 2011 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2010 Alternative Investments Pooled Funds JPY (¥) | Mar. 31, 2011 Other Assets Life Insurance Company General Accounts USD ($) | Mar. 31, 2011 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2010 Other Assets Life Insurance Company General Accounts JPY (¥) | Mar. 31, 2011 Other Assets Other USD ($) | Mar. 31, 2011 Other Assets Other JPY (¥) | Mar. 31, 2010 Other Assets Other JPY (¥)
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Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of pension plan assets | $ 1,027 | ¥ 85,396 | $ 1,033 | ¥ 85,967 | ¥ 74,111 | $ 12 | ¥ 1,016 | ¥ 903 | $ 12 | [1] | ¥ 1,016 | [1] | ¥ 903 | [2] | $ 0 | [3] | ¥ 0 | [3] | $ 0 | [4] | ¥ 0 | [4] | $ 0 | [3] | ¥ 0 | [3] | $ 0 | [5] | ¥ 0 | [5] | $ 0 | ¥ 0 | $ 0 | [6] | ¥ 0 | [6] | $ 0 | [7] | ¥ 0 | [7] | $ 0 | [8] | ¥ 0 | [8] | $ 955 | ¥ 79,432 | ¥ 80,336 | $ 0 | [1] | ¥ 0 | [2] | $ 225 | [3] | ¥ 18,690 | [3] | ¥ 19,335 | [3] | $ 306 | [4] | ¥ 25,468 | [4] | ¥ 25,847 | [4] | $ 143 | [3] | ¥ 11,864 | [3] | ¥ 11,514 | [3] | $ 92 | [5] | ¥ 7,655 | [5] | ¥ 7,416 | [5] | $ 13 | ¥ 1,076 | ¥ 1,060 | $ 80 | [6] | ¥ 6,685 | [6] | ¥ 6,394 | [6] | $ 65 | [7] | ¥ 5,386 | [7] | ¥ 5,291 | [7] | $ 31 | [8] | ¥ 2,608 | [8] | ¥ 3,479 | [8] | $ 60 | ¥ 4,948 | ¥ 4,728 | $ 0 | [1] | ¥ 0 | [2] | $ 0 | [3] | ¥ 0 | [3] | $ 0 | [4] | ¥ 0 | [4] | $ 0 | [3] | ¥ 0 | [3] | $ 0 | [5] | ¥ 0 | [5] | $ 0 | ¥ 0 | $ 60 | [6] | ¥ 4,948 | [6] | $ 57 | [6] | ¥ 4,728 | [6] | ¥ 3,514 | $ 0 | [7] | ¥ 0 | [7] | $ 0 | [8] | ¥ 0 | [8] | $ 12 | [1] | ¥ 1,016 | [1] | ¥ 903 | [2] | $ 225 | [3] | ¥ 18,690 | [3] | ¥ 19,335 | [3] | $ 306 | [4] | ¥ 25,468 | [4] | ¥ 25,847 | [4] | $ 143 | [3] | ¥ 11,864 | [3] | ¥ 11,514 | [3] | $ 92 | [5] | ¥ 7,655 | [5] | ¥ 7,416 | [5] | $ 13 | ¥ 1,076 | ¥ 1,060 | $ 140 | [6] | ¥ 11,633 | [6] | ¥ 11,122 | [6] | $ 65 | [7] | ¥ 5,386 | [7] | ¥ 5,291 | [7] | $ 31 | [8] | ¥ 2,608 | [8] | ¥ 3,479 | [8]
[1] | Equity securities of Japanese companies in which the Company and certain subsidiaries invest as pension plan assets include units of ORIX JREIT Inc. in the amounts of ¥34 million ($0 million) at March 31, 2011.
[2] | Equity securities of Japanese companies in which the Company and certain subsidiaries invest as pension plan assets include units of ORIX JREIT Inc. in the amounts of ¥36 million at March 31, 2010.
[3] | These funds invest in listing shares only.
[4] | These funds invest approximately 70% in Japanese government bonds, approximately 10% in Japanese municipal bonds, and approximately 20% in Japanese corporate bonds.
[5] | These funds invest mainly in foreign government bonds.
[6] | These funds invest in hedge funds as alternative investments.
[7] | Life insurance company general accounts are accounts with guaranteed capital and minimum interest rate, in which life insurance companies manage funds on several contracts.
[8] | Others include mainly short-term instruments.

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- Definition Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] + 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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