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Income Taxes - Income Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Tax at federal statutory rate                 $ (47,134) $ (28,613) $ (212)
Tax benefit from loss from continuing operations                 (925) (123) 0
Other permanent differences                 1,195 2,295 1,903
State taxes, net of federal benefit                 (7,263) (3,937) (30)
Veloce accrued liability                 26,749 24,046 0
Valuation allowance                 28,715 11,600 1,441
Change in contingency reserve                 74 52 94
Other                 481 361 622
Total current and deferred (1,012) [1],[2] 618 [3] (360) 200 331 [1],[4] 206 581 (190) (554) 928 399
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                      
Tax at federal statutory rate                 35.00% 35.00% 35.00%
Tax benefit from loss from continuing operations                 1.00% 0.00% 0.00%
Other permanent differences                 (1.00%) (3.00%) (314.00%)
State taxes, net of federal benefit                 5.00% 5.00% 5.00%
Veloce accrued liability                 (20.00%) (29.00%) 0.00%
Valuation allowance                 (21.00%) (14.00%) (237.00%)
Change in contingency reserve                 0.00% 0.00% (15.00%)
Other                 0.00% (1.00%) (103.00%)
Effective income tax rate                 0.00% (1.00%) (66.00%)
Internal Revenue Service (IRS) [Member]
                     
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Federal and state tax credits                 (1,909) (4,131) (3,010)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                      
Federal and state tax credits                 1.00% 5.00% 496.00%
State and Local Jurisdiction [Member]
                     
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Federal and state tax credits                 $ (537) $ (622) $ (409)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                      
Federal and state tax credits                 0.00% 1.00% 67.00%
[1] During fiscal 2012, one significant product development milestone relating to the Veloce project was considered probable of achievement and accordingly $60.4 million was recognized as research and development expense (see further discussion in Note 4 to the Notes to Consolidated Financial Statements relating to Veloce). However, approximately $8.0 million of the R&D expense was incorrectly recognized as this expense amount related to Unallocated Veloce Units that had not yet been distributed as of March 31, 2012. R&D expenses were also recognized during the first three quarters of fiscal 2013 in connection with further progress made in connection with the performance milestones relating to Veloce. However, the R&D expenses recognized during the first three quarters of fiscal 2013 also incorrectly included immaterial amounts related to the Unallocated Veloce Units. During the fourth quarter of fiscal 2013, the Company corrected the error impacting fiscal 2012 and the first three quarters of fiscal 2013. The correction of the errors resulted in a reduction of R&D expenses recognized by $10.4 million during the fourth quarter of fiscal 2013.
[2] The consolidated operating results for the fourth quarter of fiscal 2013 included a charge of $9.6 million related to the Veloce consideration.
[3] The consolidated operating results for the third quarter of fiscal 2013 included a charge of $51.9 million related to the Veloce consideration and a charge of $6.2 million related to restructuring charges.
[4] The consolidated operating results for the fourth quarter of fiscal 2012 included a charge of $60.4 million related to the Veloce initial consideration and a gain of $8.1 related to the sale of a strategic investment.