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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 239,040 | $ 225,640
Research and development and other tax credit carryforwards | 10,112 | 9,251
Accruals and reserves | 35,490 | 39,101
Fixed assets and intangible assets | 4,101 | 2,316
Other | 18,292 | 19,007
Gross deferred tax assets | 307,035 | 295,315
Valuation allowance | (261,961) | (252,302)
Total deferred tax assets | 45,074 | 43,013
Intercompany debt | (35,185) | (35,185)
Other | (9,979) | (7,828)
Total deferred tax liabilities | (45,164) | (43,013)
Net deferred tax liabilities | $ (90) |

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