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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
Jul. 04, 2021
Jun. 28, 2020
Jul. 04, 2021
Jun. 28, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income (expense) $ (3) $ 983 $ 441 $ 1,499
Retirement Plans Prior Service Credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax [1] 2 2 3 3
Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax $ (1) $ 985 [1] $ 444 [1] $ 1,502 [1]
[1] The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note Q: “Retirement Plans.”