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Other Income (Expense)—Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Other Income and Expenses [Abstract]      
Interest income $ 4,729 $ 2,156 $ 1,026
Gain on interest rate swap 195 0 5,241
Equity in losses of unconsolidated investment (460) (1,321) 0
Extinguishment of debt (1,029) 0 0
Gain on machine vision divestiture 1,750 3,500 0
Net currency gains 7,849 8,729 32,611
Other net gains 702 992 1,565
Other income (expense) - net $ 13,736 $ 14,056 $ 40,443