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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
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