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Non-operating income (Detail) - USD ($)	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Nonoperating Income (Expense) [Abstract]
Interest income	$ 217,000	$ 2,844,000
Interest expense	(84,000)	(84,000)
Realized and unrealized foreign currency (losses) gains	(870,000)	588,000
Other	0	(2,000)
Non-operating (loss) income	$ (737,000)	$ 3,346,000

X

- 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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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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