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Reclassifications Out of Accumulated Other Comprehensive (Loss) Income to Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income $ (4,517) $ (2,892) $ (11,329) $ (6,201)
Reclassifications, net of tax     468 712
Unrealized Gains (Losses) on Marketable Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax     264 468
Amortization of prior service credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax 68 81 204 244
Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, net of tax 155 415 468 712
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Marketable Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income $ 87 $ 334 $ 264 $ 468