Contractual Maturities of Investments Held (Detail) $ in Thousands	Oct. 04, 2015 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 525,052
Due after 1 year through 5 years, cost	199,957
Due after 5 years through 10 years, cost	6,075
Due after 10 years, cost	38,235
Total, cost	769,319
Due within one year, fair value	525,381
Due after 1 year through 5 years, fair value	200,305
Due after 5 years through 10 years, fair value	6,191
Due after 10 years, fair value	37,687
Total, fair value	$ 769,564