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Fair Value Measurement (Details 3) (USD $)
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Dec. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign Currency Contract, Asset, Fair Value Disclosure $ 883,000   $ 883,000    
Foreign Currency Contract Liability Fair Value Disclosure 0   0    
Accrued Contingent Consideration 1,610,000   1,610,000   0
Assets, Fair Value Disclosure [Abstract]          
Long Lived Assets Impairment Loss 300,000 0 300,000 0  
Cost-method Investments, Other than Temporary Impairment 0 0 0 300,000  
Cost-method Investments, Realized Gains (400,000) 0 (400,000) (4,500,000)  
Cost And Equity Method Investments Aggregate Carrying Amount 9,300,000   9,300,000   5,700,000
Fair Value, Inputs, Level 1 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign Currency Contract, Asset, Fair Value Disclosure 0   0    
Foreign Currency Contract Liability Fair Value Disclosure 0   0    
Accrued Contingent Consideration 0   0    
Fair Value, Inputs, Level 2 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign Currency Contract, Asset, Fair Value Disclosure 883,000   883,000    
Foreign Currency Contract Liability Fair Value Disclosure 0   0    
Accrued Contingent Consideration 0   0    
Fair Value, Inputs, Level 3 [Member]
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Foreign Currency Contract, Asset, Fair Value Disclosure 0   0    
Foreign Currency Contract Liability Fair Value Disclosure 0   0    
Accrued Contingent Consideration $ 1,610,000   $ 1,610,000