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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 (¥)
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.