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Non-operating income (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Nonoperating Income (Expense) [Abstract]        
Interest income $ 218,000 $ 1,478,000 $ 435,000 $ 4,323,000
Interest expense (88,000) (83,000) (172,000) (167,000)
Realized and unrealized foreign currency (losses) gains (50,000) 11,000 (920,000) 599,000
Other 0 (1,000) 0 (4,000)
Non-operating income (loss) $ 80,000 $ 1,405,000 $ (657,000) $ 4,751,000