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Investments - Summary of Contractual Maturities of Investments (Detail) - USD ($) $ in Thousands | Sep. 27, 2019 | Sep. 28, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Less than 1 year | $ 75,233 |
Over 1 year | 25,993 |
Total investments | $ 101,226 | $ 98,221

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