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Investments & Fair Value Measurements - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 29, 2023
Sep. 29, 2023
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)