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Goodwill and Acquired Intangibles (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jul. 02, 2011
Jul. 03, 2010
Jul. 03, 2010
Jul. 02, 2011
Jul. 03, 2010
Jan. 01, 2011
Amortization of acquired intangibles            
Cost of product $ 2,483,000   $ 591,000 $ 4,679,000 $ 1,211,000  
Cost of maintenance         1,045,000  
Amortization of acquired intangibles 4,505,000 2,551,000 2,551,000 8,964,000 5,242,000  
Total amortization of acquired intangibles 6,988,000   3,142,000 13,643,000 7,498,000  
Estimated amortization expense            
2011 - Remaining period       12,984,000    
2012       25,435,000    
2013       21,927,000    
2014       19,151,000    
2015       18,837,000    
Thereafter       80,232,000    
Total estimated amortization expense       178,566,000    
Goodwill and Acquired Intangibles (Textuals) [Abstract]            
Intangible assets allocated to in-process research and development           $ 500,000