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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Goodwill and Intangible Assets      
Goodwill impairment $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 71,394us-gaap_GoodwillImpairmentLoss
Changes in the carrying amount of goodwill      
Balance at the beginning of the period, gross 153,466us-gaap_GoodwillGross 142,658us-gaap_GoodwillGross  
Goodwill adjustments related to acquisitions 1,797us-gaap_GoodwillAcquiredDuringPeriod 10,563us-gaap_GoodwillAcquiredDuringPeriod  
Goodwill adjustments related to NeuCo   (63)us-gaap_GoodwillOtherChanges  
Effect of foreign currency translation (1,067)us-gaap_GoodwillTranslationAdjustments 308us-gaap_GoodwillTranslationAdjustments  
Balance at the end of the period, gross 154,196us-gaap_GoodwillGross 153,466us-gaap_GoodwillGross 142,658us-gaap_GoodwillGross
Balance at the beginning of the period, Accumulated impairment losses (71,893)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (71,893)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss (71,394)us-gaap_GoodwillImpairmentLoss
Balance at the end of the period, Accumulated impairment losses (71,893)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (71,893)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (71,893)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Balance at the beginning of the period, net 81,573us-gaap_Goodwill 70,765us-gaap_Goodwill  
Balance at the end of the period, net 82,303us-gaap_Goodwill 81,573us-gaap_Goodwill 70,765us-gaap_Goodwill
Intangible assets impairment losses $ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived $ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived $ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived