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Non-operating (income) expense (Tables)
 12 Months Ended
Dec. 29, 2018
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Non-operating (income) expense consists of the following (in thousands):
 
December 29,
2018
 
December 30,
2017
 
December 31,
2016
Interest income
$
(8,178
)
 
$
(2,974
)
 
$
(464
)
Realized and unrealized foreign currency (gain) loss
2,027

 
270

 
(103
)
Interest expense
706

 
678

 
3,260

Other
(287
)
 
13

 
(264
)
Total
$
(5,732
)
 
$
(2,013
)
 
$
2,429