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Financial Instruments and Derivatives - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 05, 2015
Jun. 29, 2014
Jul. 05, 2015
Jun. 29, 2014
Dec. 31, 2014
Jun. 11, 2015
Oct. 31, 2014
Dec. 31, 2013
Financial Instruments and Fair Value [Line Items]                
Available-for-sale securities, realized loss $ 100,000 $ 0 $ 100,000 $ 0        
Available-for-sale securities, realized gain 400,000 400,000 1,000,000 700,000        
Contingent consideration 15,092,000   15,092,000   $ 895,000      
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses 118,408,000   118,408,000   583,076,000      
Fair market value of investments with unrealized losses greater than one year 200,000   200,000   2,300,000      
Fair market value of investments with unrealized losses less than one year 118,200,000   118,200,000   580,800,000      
Gains (losses) on foreign currency transactions (2,100,000) 700,000 2,200,000 1,300,000        
Realized gain(loss) on foreign currency contracts 1,600,000 $ (1,100,000) (1,900,000) $ (1,900,000)        
Offsetting foreign exchange contracts 0   0   0      
AIT | Maximum                
Financial Instruments and Fair Value [Line Items]                
Contingent consideration             $ 2,100,000  
Universal Robots                
Financial Instruments and Fair Value [Line Items]                
Contingent consideration           $ 33,800,000    
Universal Robots | Maximum                
Financial Instruments and Fair Value [Line Items]                
Contingent consideration               $ 65,000,000
Foreign Currency Forward Contracts                
Financial Instruments and Fair Value [Line Items]                
Notional amount of foreign currency forward contracts $ 100,700,000   100,700,000   73,000,000      
Gains (losses) on foreign currency transactions     $ (100,000)   $ (100,000)