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Contractual Maturities of Investments in Debt Securities Held (Detail) $ in Thousands	Sep. 27, 2020 USD ($)
Schedule of Available-for-sale Securities
Due within one year, cost	$ 287,670
Due after 1 year through 5 years, cost	20,790
Due after 5 years through 10 years, cost	13,021
Due after 10 years, cost	33,524
Total, cost	355,005
Due within one year, fair market value	287,789
Due after 1 year through 5 years, fair market value	21,266
Due after 5 years through 10 years, fair market value	14,211
Due after 10 years, fair maket value	39,745
Total, fair market value	$ 363,011

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