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Restructuring Charges (Detail Textuals) (2007 Facility Consolidation and Severance Costs, USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 30, 2011
Buildings
Dec. 31, 2007
Sep. 29, 2012
Buildings
Mar. 31, 2012
Dec. 31, 2011
2007 Facility Consolidation and Severance Costs
            
Restructuring Charges (Textual) [Abstract]            
Restructuring charges     $ 17.1      
Unoccupied building   4,100        
Occupied building       4,300    
Space remittance fee         5.0  
Contractually obligated tenant improvement reimbursement expense 0.9          
Obligated to pay an additional tenant improvement reimbursement expense       0.3    
Reduction of facility consolidation restructuring reserve related to 4100 building amendment           $ 2.0
Lease expiration date       Jan. 31, 2019