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Investments (Tables) | 6 Months Ended
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Mar. 29, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Contractual Maturities of Investments | The contractual maturities of available-for-sale investments were as follows (in thousands):
| March 29, 2024 | September 29, 2023
Less than one year | $ | 219,861 |  | $ | 265,591 |
Over one year | 141,562 |  | 74,983 |
Total available-for-sale investments | $ | 361,423 |  | $ | 340,574 |
Debt Securities, Available-for-sale | The amortized cost, gross unrealized holding gains or losses and fair value of our available-for-sale investments by major investment type are summarized in the tables below (in thousands):
| March 29, 2024
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Aggregate Fair Value
Certificates of deposit | $ | 10,980 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 10,981 |
Corporate bonds | 243,039 |  |  | 36 |  |  | (1,615) |  |  | 241,460 |
Commercial paper | 48,589 |  |  | — |  |  | (60) |  |  | 48,529 |
U.S. Treasuries and agency bonds | 60,460 |  |  | 75 |  |  | (82) |  |  | 60,453 |
Total short-term investments | $ | 363,068 |  |  | $ | 112 |  |  | $ | (1,757) |  |  | $ | 361,423 |
| September 29, 2023
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Aggregate Fair Value
Corporate bonds | $ | 145,234 |  |  | $ | — |  |  | $ | (2,845) |  |  | $ | 142,389 |
Commercial paper | 176,405 |  |  | — |  |  | (129) |  |  | 176,276 |
U.S. Treasuries and agency bonds | 21,895 |  |  | 18 |  |  | (4) |  |  | 21,909 |
Total short-term investments | $ | 343,534 |  |  | $ | 18 |  |  | $ | (2,978) |  |  | $ | 340,574 |

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