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Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 29, 2023 | Sep. 29, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 56,474 | $ 136,660
Less Than 12 Months, Gross Unrealized Losses | (256) | (921)
12 Months or Greater, Fair Value | 56,249 | 63,035
12 Months or Greater, Gross Unrealized Loss | (1,062) | (1,947)
U.S. agency securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 853
Less Than 12 Months, Gross Unrealized Losses | 0 | (7)
12 Months or Greater, Fair Value | 0 | 0
12 Months or Greater, Gross Unrealized Loss | 0 | 0
Government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 12,250 | 26,756
Less Than 12 Months, Gross Unrealized Losses | (67) | (247)
12 Months or Greater, Fair Value | 30,457 | 40,235
12 Months or Greater, Gross Unrealized Loss | (629) | (1,183)
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 5,840
Less Than 12 Months, Gross Unrealized Losses | 0 | (3)
12 Months or Greater, Fair Value | 0 | 0
12 Months or Greater, Gross Unrealized Loss | 0 | 0
Corporate bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 36,002 | 79,846
Less Than 12 Months, Gross Unrealized Losses | (137) | (461)
12 Months or Greater, Fair Value | 19,546 | 14,634
12 Months or Greater, Gross Unrealized Loss | (335) | (558)
Municipal debt securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Less Than 12 Months, Fair Value | 8,222 | 23,365
Less Than 12 Months, Gross Unrealized Losses | (52) | (203)
12 Months or Greater, Fair Value | 6,246 | 8,166
12 Months or Greater, Gross Unrealized Loss | $ (98) | $ (206)

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