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Non-operating (income) expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Nonoperating Income (Expense) [Abstract]      
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
Nonoperating Income (Expense) $ (5,732) $ (2,013) $ 2,429