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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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