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Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Supplemental Cash Flow Information [Abstract]    
Document Fiscal Year Focus 2014  
Gross unrealized gains (losses) $ (0.4) $ (1.3)
Gross unrealized gains (losses), net of taxes $ (0.3) $ (0.8)
Contractual maturities period of marketable securities, minimum (in months) 6 months  
Contractual maturities period of marketable securities, maximum (in months) 20 months