Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Income Taxes
Domestic statutory income tax rate	17.00%	17.00%	17.00%
Income resulting from tax holidays and tax incentives	$ 66,500,000	$ 65,400,000	$ 85,300,000
Income tax holiday income tax benefits basic earning per share	$ 0.09
Income tax holiday income tax benefits diluted earning per share	$ 0.08
Effect on basic and diluted earnings per share due to income resulting from tax holidays and tax incentives		$ 0.08	$ 0.10
Expiration date of existing holidays	2018
Tax loss carryforwards	7,900,000,000
Valuation allowance relating to income tax benefits	34,000,000
Interest recognized related to unrecognized tax benefits	5,000,000	5,300,000
Penalties recognized related to unrecognized tax benefits	0	0
Accrued payment of interest related to unrecognized tax benefits	5,500,000	66,800,000
Accrued payment of penalties related to unrecognized tax benefits	$ 0	$ 300,000

Income Tax Disclosure Abstract

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- Definition

Income Tax Holiday Income Tax Benefits Basic Earning Per Share

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- Definition

Income Tax Holiday Income Tax Benefits Diluted Earning Per Share

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The amount of the valuation allowance recorded for tax benefits that will be credited to shareholders' equity if those tax benefits subsequently become realizable. Examples include 1) adjustments of the opening balance of retained earnings for certain changes in accounting principle or a correction of an error; 2) gains and losses included in comprehensive income but excluded from net income; 3) expenditures that are deductible for income tax purposes that are reported as a reduction of shareholders' equity; 4) expenses for employee stock options recognized differently for financial reporting purposes and income tax purposes; 5) dividends paid on unallocated shares held by an ESOP that are charged to retained earnings and 6) deductible temporary differences that existed at the date of a quasi reorganization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 36
-Subparagraph a-g

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48
-Subparagraph b

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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 domestic income tax settlements during the period.

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- Definition

The per share effect of the aggregate dollar amount of the income tax benefit resulting from the income tax holidays granted to the entity by taxing jurisdictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 11
-Section C

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- Definition

The date on which the special tax status will terminate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 11
-Section C

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The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to income that is exempt from income tax because of [foreign] tax holidays an entity has received in the period. A foreign tax "holiday" refers to a foreign jurisdiction that attempts to attract in-coming or foreign investment by offering an exemption from income taxes for some defined period of time.

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- Definition

The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48
-Subparagraph a

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- Definition

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 16

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph c

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This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense shall be recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 15

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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