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Additional Balance Sheet and Cash Flow Information (Narrative) (Detail) (USD $)
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Supplemental Cash Flow Information [Abstract]    
Document Fiscal Year Focus 2015  
Gross unrealized gains (losses) $ (106,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss $ (67,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Gross unrealized gains (losses), net of taxes $ (67,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax $ (42,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Contractual maturities period of marketable securities, minimum (in months) 1 month  
Contractual maturities period of marketable securities, maximum (in months) 25 months