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Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) - USD ($)
9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Supplemental Cash Flow Information [Abstract]    
Document Fiscal Year Focus 2015  
Gross unrealized gains (losses) $ (467,000) $ (419,000)
Gross unrealized gains (losses), net of taxes $ (294,000) $ (264,000)
Contractual maturities period of marketable securities, minimum (in months) 2 months  
Contractual maturities period of marketable securities, maximum (in months) 19 months