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Non-operating income Non-operating income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Nonoperating Income (Expense) [Abstract]
Interest income	$ 1,478	$ 3,609	$ 4,323	$ 7,042
Interest expense	(83)	(80)	(167)	(161)
Realized and unrealized foreign currency gains	11	6	599	541
Other	(1)	(6)	(4)	(7)
Non-operating income	$ 1,405	$ 3,529	$ 4,751	$ 7,415

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of interest income earned from interest bearing assets classified as other.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Amount of income (expense) related to nonoperating activities, classified as other.

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