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Reclassifications Out of Accumulated Other Comprehensive (Loss) Income to Statements of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, tax $ 102 $ 35
Unrealized Gains (Losses) on Marketable Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, tax 64 (11)
Amortization of prior service credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, tax $ 38 $ 46