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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Consolidated Statements Of Operations [Abstract]      
Revenues $ 76,543 $ 286,603 $ 315,955
Cost and operating expenses:      
Cost of revenues 82,882 308,183 200,977
Research and development 27,271 32,517 23,593
Selling, general and administrative 72,118 72,382 50,446
Restructuring and impairments 9,188 49,955 451
Write-off of advance payment 20,551    
Amortization of acquisition related intangibles 972 1,549 1,827
Total operating expenses 212,982 464,586 277,294
Operating (loss) income (136,439) (177,983) 38,661
Interest income, net 243 830 788
Other income (expense), net 738 6,822 (2,693)
(Loss) income before income tax expense (135,458) (170,331) 36,756
Income tax expense 1,369 15,953 20,508
Net (loss) income $ (136,827) $ (186,284) $ 16,248
Net (loss) income per common share      
Basic $ (2.69) $ (3.95) $ 0.37
Diluted $ (2.69) $ (3.95) $ 0.36
Weighted average number of common shares outstanding      
Basic 50,842 47,103 44,445
Diluted 50,842 47,103 45,290