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Deposits - Additional Information (Detail) In Millions	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)
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

X

- Definition

Deposits From Banking Clients [Line Items]

+ Details

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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