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Intangible Assets (Amortizing Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2013
Dec. 28, 2012
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 168,267 $ 168,267
Finite-Lived Intangible Assets, Accumulated Amortization (88,297) (84,929)
Foreign Currency Translation 3,247 4,007
Amortizing intangible assets, net 83,217 87,345
Purchased Technology And Patents [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 95,576 95,576
Finite-Lived Intangible Assets, Accumulated Amortization (63,574) (61,659)
Foreign Currency Translation 1,665 1,932
Amortizing intangible assets, net 33,667 35,849
Customer Lists [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 68,257 68,257
Finite-Lived Intangible Assets, Accumulated Amortization (20,367) (18,929)
Foreign Currency Translation 778 1,270
Amortizing intangible assets, net 48,668 50,598
Other Intangible Assets [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 4,434 4,434
Finite-Lived Intangible Assets, Accumulated Amortization (4,356) (4,341)
Foreign Currency Translation 804 805
Amortizing intangible assets, net $ 882 $ 898