Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) - USD ($) $ in Thousands	Oct. 02, 2015	Jan. 02, 2015
Fair Value Measurements [Line Items]
Due within one year, Amortized Cost	$ 10,821
Due between one and two years, Amortized Cost	16,000
Total Amortized Cost	26,821
Due within one year, Estimated Fair Value	10,823
Due between one and two years, Estimated Fair Value	16,014
Total Estimated Fair Value	$ 26,837	$ 24,913