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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 05, 2014
Jul. 05, 2014
Restructuring Cost and Reserve [Line Items]    
Balance $ 2,856 $ 3,478
Charges      
Assumption changes (7) (34)
Payments (669) (1,597)
Accretion of Liability 8 16
Balance 2,188 2,188
2013 Facility Lease Obligation and Severance Costs | Reduction in Force Activities
   
Restructuring Cost and Reserve [Line Items]    
Balance 2,021 2,550
Charges      
Assumption changes (7) (36)
Payments (566) (1,066)
Accretion of Liability      
Balance 1,448 1,448
2013 Facility Lease Obligation and Severance Costs | Facility Lease Obligation
   
Restructuring Cost and Reserve [Line Items]    
Balance 835 928
Charges      
Assumption changes    2
Payments (103) (206)
Accretion of Liability 8 16
Balance $ 740 $ 740