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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Mar. 31, 2011
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 225,640 | $ 194,216
Research and development and other tax credit carryforwards | 9,251 | 9,324
Accruals and reserves | 39,101 | 45,917
Fixed assets and intangible assets | 2,316 | 3,042
Other | 19,007 | 20,277
Gross deferred tax assets | 295,315 | 272,776
Valuation allowance | (252,302) | (220,596)
Total deferred tax assets | 43,013 | 52,180
Intangible assets from acquisitions |  | (378)
Intercompany debt | (35,185) | (33,872)
Other | (7,828) | (17,930)
Total deferred tax liabilities | (43,013) | (52,180)
Net deferred tax assets |  |

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- Definition The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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