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Fair Value of Pension Plan Assets by Asset Category (Detail) (JPY ¥) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | --- | ---
Overseas Pension Plans Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | ¥ 62,042 |  | ¥ 3,825 |  | ¥ 3,040
Overseas Pension Plans Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 57,360 |  | 0 |  |
Overseas Pension Plans Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 4,682 |  | 3,825 |  |
Overseas Pension Plans Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  | 0 |  |
Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 104,984 |  | 93,144 |  | 82,905
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  | 0 |  |
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 104,984 |  | 93,144 |  |
Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  | 0 |  |
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 59 | [1] | 57 | [2] |
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [2] |
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 59 | [1] | 57 | [2] |
Pooled Equity Securities Funds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [2] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 14,981 | [3] | 12,458 | [4] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 18,430 | [2] | 14,613 | [2] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [3] | 0 | [4] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [2] | 0 | [2] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 14,981 | [3] | 12,458 | [4] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 18,430 | [2] | 14,613 | [2] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [3] | 0 | [4] |
Pooled Equity Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [2] | 0 | [2] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 28,931 | [5] | 26,208 | [6] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 16,702 | [7] | 14,641 | [8] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [5] | 0 | [6] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [7] | 0 | [8] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 28,931 | [5] | 26,208 | [6] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 16,702 | [7] | 14,641 | [8] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Japan |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [5] | 0 | [6] |
Pooled Debt Securities Funds | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [7] | 0 | [8] |
Municipal Bonds | Overseas Pension Plans Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 5,399 |  | 3,332 |  |
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 1,779 |  | 0 |  |
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 3,620 |  | 3,332 |  |
Municipal Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  | 0 |  |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 177 | [9] |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 161 | [9] |  |  |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 0 | [9] |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 1 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [9] |  |  |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 177 | [9] |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 2 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 161 | [9] |  |  |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 0 | [9] |
Life Insurance Company General Accounts | Overseas Pension Plans Defined Benefit | Level 3 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [9] |  |  |
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 17,860 | [9] | 17,703 | [9] |
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [9] | 0 | [9] |
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 17,860 | [9] | 17,703 | [9] |
Life Insurance Company General Accounts | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [9] | 0 | [9] |
Other | Overseas Pension Plans Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 259 | [10] |
Other | Overseas Pension Plans Defined Benefit | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 842 | [10] |  |  |
Other | Overseas Pension Plans Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 0 | [10] |
Other | Overseas Pension Plans Defined Benefit | Level 1 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [10] |  |  |
Other | Overseas Pension Plans Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 259 | [10] |
Other | Overseas Pension Plans Defined Benefit | Level 2 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 842 | [10] |  |  |
Other | Overseas Pension Plans Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets |  |  | 0 | [10] |
Other | Overseas Pension Plans Defined Benefit | Level 3 | Other Assets |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [10] |  |  |
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 8,080 | [10] | 7,521 | [10] |
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 1 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [10] | 0 | [10] |
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 2 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 8,080 | [10] | 7,521 | [10] |
Other | Domestic Pension Plans Of Foreign Entity Defined Benefit | Level 3 |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [10] | 0 | [10] |
Shares | Overseas Pension Plans Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 24,420 | [1] |  |  |
Shares | Overseas Pension Plans Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 24,420 | [1] |  |  |
Shares | Overseas Pension Plans Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |  |
Shares | Overseas Pension Plans Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |  |
Government Bonds | Overseas Pension Plans Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 15,317 |  |  |  |
Government Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 15,317 |  |  |  |
Government Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  |  |  |
Government Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  |  |  |
Corporate Bonds | Overseas Pension Plans Defined Benefit | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 15,844 |  |  |  |
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 1 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 15,844 |  |  |  |
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 2 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 |  |  |  |
Corporate Bonds | Overseas Pension Plans Defined Benefit | Level 3 | Overseas |  |  |  |  |
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items] |  |  |  |  |
Fair value of pension plan assets | ¥ 0 |  |  |  |
[1] | These shares and funds invest in listing shares.
[2] | These funds invest in listing shares.
[3] | These funds invest in listing shares include shares of ORIX Corporation in the amounts of ¥25 million and units of ORIX JREIT Inc. in the amounts of ¥181 million at March 31, 2014.
[4] | These funds invest in listing shares include shares of ORIX Corporation in the amounts of ¥12 million and units of ORIX JREIT Inc. in the amounts of ¥179 million at March 31, 2013.
[5] | These funds invest approximately 70% in Japanese government bonds, approximately 10% in Japanese municipal bonds, and approximately 20% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥46 million and investment corporation bonds of ORIX JREIT Inc. in the amounts of ¥20 million at March 31, 2014.
[6] | These funds invest approximately 70% in Japanese government bonds, approximately 10% in Japanese municipal bonds, and approximately 20% in Japanese corporate bonds. These funds include corporate bonds of ORIX Corporation in the amounts of ¥107 million and investment corporation bonds of ORIX JREIT Inc. in the amounts of ¥41 million at March 31, 2013.
[7] | These funds invest entirely in foreign government bonds.
[8] | These funds invest approximately 90% in foreign government bonds and approximately 10% in foreign corporate bonds.
[9] | Life insurance company general accounts are accounts with guaranteed capital and minimum interest rate, in which life insurance companies manage funds on several contracts.
[10] | Others include derivative instruments held for hedging change in the fair value of equity securities, and short-term instruments.

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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 non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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