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)
Goodwill	154,899
Net deferred tax asset	(26,606)
Total purchase price	321,641
Developed Technology [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	161,400
Trademarks [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	5,300
Customer relationships [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	12,200
In-process research and development [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	36,200
Covenants not to compete [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	700
Acquisition-related Intangible Assets [Member]
Fair values assigned to tangible assets, intangible assets acquired and liabilities assumed
Total intangible assets	$ 215,800