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Significant Concentrations of Credit Risk - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2011 Japan USD ($)	Mar. 31, 2011 Japan JPY (¥)	Mar. 31, 2010 Japan JPY (¥)	Mar. 31, 2011 U.S. USD ($)	Mar. 31, 2011 U.S. JPY (¥)	Mar. 31, 2010 U.S. JPY (¥)	Mar. 31, 2011 Real Estate Investment	Mar. 31, 2010 Real Estate Investment
Concentration Risk [Line Items]
Concentration of risk description	No concentration with a single obligor exceeded 1% of consolidated total assets	No concentration with a single obligor exceeded 1% of consolidated total assets
Credit exposures on a geographic basis			$ 58,378	¥ 4,854,000	¥ 4,809,000	$ 12,040	¥ 1,001,000	¥ 387,000
Concentration risk , percentage			76.00%	76.00%	85.00%				12.70%	14.40%

X

- Definition

Reflects the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph b

+ Details

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X

- Definition

Description of risks that arise due to the nature or amount of financing received from a particular lender or reliance placed on that lender. The description should be adequate to inform financial statement users of the general nature of the risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-6
-Paragraph 21, 22, 24

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ Details

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