Contractual Maturities of Investments Held (Detail) $ in Thousands	Oct. 02, 2016 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 598,416
Due after 1 year through 5 years, cost	288,344
Due after 5 years through 10 years, cost	12,787
Due after 10 years, cost	35,882
Total, cost	935,429
Due within one year, fair value	598,501
Due after 1 year through 5 years, fair value	288,370
Due after 5 years through 10 years, fair value	13,026
Due after 10 years, fair value	38,689
Total, fair value	$ 938,586