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Fair Value Measurements (Assets) (Details) - Fair value, measurements, recurring - USD ($)
$ in Thousands
Oct. 01, 2016
Jan. 02, 2016
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments $ (1,790) $ (1,252)
Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0 0
Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments (1,790) (1,252)
Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0 0
Government securities    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 6,368 9,663
Government securities | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 0 0
Government securities | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 6,368 9,663
Government securities | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 0 0
Corporate bonds    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 6,140 2,405
Corporate bonds | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 0 0
Corporate bonds | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure 6,140 2,405
Corporate bonds | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, fair value disclosure $ 0 $ 0