Financial Instruments - Cash, Cash Equivalents and Marketable Securities by Investment Category (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Sep. 28, 2024	Dec. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	$ 234,980		$ 144,184
Unrealized Gain	50		122
Unrealized Loss	(13)		0
Total	327,820		221,036
Total	327,857		221,158
Cash and cash equivalents	279,955	$ 169,732	169,732
Marketable Securities	47,902	$ 51,426	51,426
Level 1:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	40,881		25,548
Amortized Cost	40,881		25,548
Estimated Fair Value	40,881		25,548
Level 1: \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	40,881		25,548
Cash equivalents	40,881		25,548
Estimated Fair Value	40,881		25,548
Level 2:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	51,959		51,304
Cash equivalents	4,094		0
Unrealized Gain	50		122
Unrealized Loss	(13)		0
Estimated Fair Value	51,996		51,426
Marketable Securities	47,902		51,426
Level 2: \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	51,959		51,304
Cash equivalents	4,094		0
Unrealized Gain	50		122
Unrealized Loss	(13)		0
Estimated Fair Value	51,996		51,426
Marketable Securities	$ 47,902		$ 51,426

Cash And Cash Equivalents, At Carrying Value And Debt Securities, Available-For-Sale, Excluding Accrued Interest

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Cash Equivalents, At Carrying Value And Debt Securities, Available-For-Sale, Amortized Cost, Excluding Accrued Interest, After Allowance For Credit Loss

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Fair value portion of asset recognized for present right to economic benefit.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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