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Non-operating Income Non-operating Income - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Nonoperating Income (Expense) [Abstract]      
Interest income $ 13,917 $ 8,178 $ 2,974
Realized and unrealized foreign currency loss (627) (2,027) (270)
Interest expense (328) (706) (678)
Other 12 (287) 13
Non-operating income $ 12,950 $ 5,732 $ 2,013