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Goodwill and Other Purchased Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 27, 2014
Dec. 28, 2013
Segment Reporting Information [Line Items]    
Goodwill $ 71,313 [1] $ 58,756
Additions net of adjustments   10,930
Impact of currency exchange (3,448) 1,627
Goodwill 67,865 71,313 [1]
Semiconductor Equipment [Member]
   
Segment Reporting Information [Line Items]    
Goodwill 67,983 55,520
Additions net of adjustments   10,930
Impact of currency exchange (3,257) 1,533
Goodwill 64,726 67,983
Microwave Communications Equipment [Member]
   
Segment Reporting Information [Line Items]    
Goodwill 3,330 3,236
Impact of currency exchange (191) 94
Goodwill $ 3,139 $ 3,330
[1] Derived from December 28, 2013 audited financial statements