Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2014	Dec. 28, 2012
Fair Value Measurements [Line Items]
Due within one year, Amortized Cost	$ 12,740
Due between one and two years, Amortized Cost	20,415
Total Amortized Cost	33,155
Due within one year, Estimated FairValue	12,744
Due between one and two years, Estimated FairValue	20,427
Total Estimated FairValue	$ 33,171	$ 20,881