Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statement of Operations (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 27, 2026 |
Sep. 28, 2025 |
Sep. 27, 2026 |
Sep. 28, 2025 |
|
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income (expense) | $ 8 | $ 0 | $ (5) | $ (89) |
| Unrealized (losses) gains, net | (69) | 0 | (69) | 350 |
| Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | ||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Interest income (expense) | 8 | 0 | (5) | (89) |
| Reclassifications, net of tax | (5) | (89) | ||
| Amortization of Prior Service Credit | ||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Reclassifications, net of tax | 1 | 2 | 3 | 6 |
| Accumulated Other Comprehensive Income (Loss) | ||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
| Reclassifications, net of tax | $ (60) | $ 2 | $ (71) | $ 267 |