Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) - USD ($) $ in Thousands	Jul. 03, 2015	Jan. 02, 2015
Fair Value Measurements [Line Items]
Due within one year, Amortized Cost	$ 13,414
Due between one and two years, Amortized Cost	4,526
Total Amortized Cost	17,940
Due within one year, Estimated Fair Value	13,411
Due between one and two years, Estimated Fair Value	4,524
Total Estimated Fair Value	$ 17,935	$ 24,913