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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Jun. 29, 2025
Sep. 28, 2025
Sep. 29, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) $ 0 $ 7   $ (89) $ (86)
Unrealized (losses) gains, net (0) 0 $ 350 350 1,780
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income (expense) (0) 7 (89)   (86)
Reclassifications, net of tax       (89) (86)
Amortization of Prior Service Credit          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Reclassifications, net of tax 2 2 6 6 6
Accumulated Other Comprehensive Income (Loss)          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Reclassifications, net of tax $ 2 $ 9 $ 267 $ 267 $ 1,700