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Contractual Maturities of Investments Held (Detail)
$ in Thousands
Oct. 01, 2017
USD ($)
Schedule of Available-for-sale Securities  
Due within one year, cost $ 1,218,752
Due after 1 year through 5 years, cost 136,081
Due after 5 years through 10 years, cost 14,129
Due after 10 years, cost 38,783
Total, cost 1,407,745
Due within one year, fair market value 1,217,830
Due after 1 year through 5 years, fair market value 135,889
Due after 5 years through 10 years, fair market value 13,818
Due after 10 years, fair market value 40,132
Total, fair market value $ 1,407,669