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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
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)