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Investments (Tables) | 12 Months Ended
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Sep. 27, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Available for Sale Investments | The amortized cost, gross unrealized holding gains or losses and fair value of our available-for-sale investments by major investments type as of September 27, 2019 and September 28, 2018 are summarized in the tables below (in thousands):
| September 27, 2019
| Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Aggregate Fair Value
Corporate bonds |  | $ | 29,578 |  |  | $ | 112 |  |  | $ | (93 | ) |  | $ | 29,597 |
Commercial paper |  | 71,646 |  |  | 1 |  |  | (18 | ) |  | 71,629 |
Total investments |  | $ | 101,224 |  |  | $ | 113 |  |  | $ | (111 | ) |  | $ | 101,226 |
| September 28, 2018
| Amortized Cost | Gross Unrealized Holding Gains | Gross Unrealized Holding Losses | Aggregate Fair Value
Corporate bonds |  | $ | 28,731 |  |  | $ | — |  |  | $ | (460 | ) |  | $ | 28,271 |
Commercial paper |  | 69,966 |  |  | — |  |  | (16 | ) |  | 69,950 |
Total investments |  | $ | 98,697 |  |  | $ | — |  |  | $ | (476 | ) |  | $ | 98,221 |
Summary of Contractual Maturities of Investments | The contractual maturities of available-for-sale investments were as follows (in thousands):
| September 27, 2019
Less than 1 year | $ | 75,233 |
Over 1 year | 25,993 |
Total investments | $ | 101,226 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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