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Business Acquisition (Details 2) (USD $)
In Thousands
May 24, 2011
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Net tangible liabilities acquired$ (22,452)
Goodwill154,899
Net deferred tax asset(26,606)
Total purchase price321,641
Developed Technology [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets161,400
Trademarks [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets5,300
Customer relationships [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets12,200
In-process research and development [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets36,200
Covenants not to compete [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets700
Acquisition-related Intangible Assets [Member]
 
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed 
Total intangible assets$ 215,800