Income Taxes (Details 1)	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
A reconciliation of the differences between the Japanese statutory tax rate and the effective tax rate
Statutory tax rate	41.00%	41.00%	(41.00%)
Non-deductible expenses	1.30%	10.30%	1.90%
Income tax credits	(2.00%)	(18.00%)	11.40%
Change in valuation allowances	174.50%	4.70%	12.90%
Change in deferred tax liabilities on undistributed earnings of foreign subsidiaries and corporate joint ventures	1.50%	5.80%	(31.80%)
Lower tax rate applied to life and non-life insurance business in Japan	(2.80%)	(30.30%)	0.80%
Foreign income tax differential	(10.50%)	(17.60%)	0.50%
Adjustments to tax accruals and reserves	4.50%	16.20%	(7.30%)
Effect of equity in net income (loss) of affiliated companies	(2.80%)	46.00%	5.90%
Other	2.80%	(6.20%)	5.10%
Effective income tax rate	207.50%	51.90%	(41.60%)

Adjustments to tax accruals and reserves for unrecognized tax benefit.

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- Definition

Effective income tax rate reconciliation change in deferred tax liabilities on undistributed earnings of foreign subsidiaries and corporate joint ventures.

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Effective income tax rate reconciliation lower tax rate applied to life and non-life insurance business in domestic country.

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Effect of equity in net income loss of affiliated companies.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 47

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Subparagraph 2
-Article 4

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 47

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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all nondeductible expenses under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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