Income Taxes (Schedule of Differences Between Statutory Tax Rate and Effective Tax Rate) (Details)	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Statutory federal benefit rate	(35.00%)	(35.00%)	(35.00%)
State taxes, net of federal benefit	(5.80%)	(3.40%)	(2.10%)
Differences between statutory rate and foreign effective tax rate	12.30%	4.20%	2.60%
Valuation allowance	23.70%	17.20%	42.80%
Research and development credits	(2.40%)	(1.10%)	(1.60%)
Non-deductible acquisition-related costs and tax expense from integration restructurings	0.00%	8.20%	0.00%
Non-deductible stock-based compensation	12.10%	5.00%	3.70%
Other	2.60%	0.80%	0.00%
Effective tax expense (benefit) rate	(1.10%)	(4.10%)	27.20%
Intangibles [Member]
Impairments	0.00%	0.00%	13.60%
Strategic Investments [Member]
Differences between book and tax gain or loss on strategic investments	(8.60%)	0.00%	2.60%
RWS Facilities [Member]
Impairments	0.00%	0.00%	0.60%

Effective Income Tax Rate Reconciliation Book Tax Gain Losses Differencess On Strategic Investments

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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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- Definition

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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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to nondeductible impairment losses under enacted tax laws.

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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 nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, not otherwise listed in the existing taxonomy.

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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 differences in the deductibility or nondeductibility of incentive stock options and other share based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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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 all other items not otherwise listed in the existing taxonomy.

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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 state and local income tax expense (benefit), net of the federal tax benefit (expense) thereon, recorded during the period.

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- Definition

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

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