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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 27, 2013
Dec. 28, 2012
Goodwill [Line Items]    
Beginning Balance $ 45,359 $ 20,590
Goodwill acquired during the year 21,623 24,769
Foreign currency translation (48)  
Ending Balance $ 66,934 $ 45,359