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Non-operating income (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Nonoperating Income (Expense) [Abstract]
Interest income	$ 242,000	$ 797,000	$ 677,000	$ 5,120,000
Interest expense	(87,000)	(84,000)	(259,000)	(250,000)
Realized and unrealized foreign currency (losses) gains	(233,000)	647,000	(1,153,000)	1,246,000
Other	0	(3,000)	0	(8,000)
Non-operating (loss) income	$ (78,000)	$ 1,357,000	$ (735,000)	$ 6,108,000

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- Definition

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

+ References

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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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