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Deposits - Additional Information (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥)
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Deposits From Banking Clients [Line Items] |  |  |
Time deposits, including certificates of deposit issued in amounts of 10 million Yen or more | $ 6,997 | ¥ 581,761 | ¥ 462,743

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- Definition Deposits From Banking Clients [Line Items] + Details
Name: | ix_DepositsFromBankingClientsLineItems
Namespace Prefix: | ix
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Time Deposits, 10,000,000 Yen or More + Details
Name: | ix_TimeDeposits10000000OrMore
Namespace Prefix: | ix
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant