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Fair Value of Pension Plan Assets by Asset Category (Parenthetical) (Detail) In Millions, unless otherwise specified |  |  |  |  |  | 12 Months Ended
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 USD ($) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 ORIX JREIT Inc. Japanese Companies Equity Securities USD ($) | Mar. 31, 2011 ORIX JREIT Inc. Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2010 ORIX JREIT Inc. Japanese Companies Equity Securities JPY (¥) | Mar. 31, 2011 Japanese Government Bond Securities | Mar. 31, 2011 Japanese Municipal Bonds Securities | Mar. 31, 2011 Japanese Corporate Bonds Securities
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 | $ 0 | ¥ 34 | ¥ 36 |  |  |
Pension plan assets investment allocation in pooled funds |  |  |  |  |  |  |  |  | 70.00% | 10.00% | 20.00%

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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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- Definition Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. + 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(2) + Details
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