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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 11, 2016
Apr. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Jan. 02, 2016
Jan. 03, 2015
Acquisition            
Payment of earn-out for the first annual period     $ 9,500 $ 4,464    
Energy Micro            
Acquisition            
Cash consideration   $ 20,000        
Payment of earn-out for the first annual period   $ 6,300        
Earn-out payment representing the Departure Percentage portion and recorded as compensation expense           $ 1,800
Remaining Earn-out payment representing additional consideration     4,500      
Earn-Out, fair value $ 16,000          
Potential maximum contingent consideration that could be paid 26,700          
Additional consideration 11,400          
Compensation expense $ 4,600   2,700   $ 1,900  
Gain from the adjustment to fair value due to settlement     $ 2,700