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Financial Instruments - Cash, Cash Equivalents and Marketable Securities by Investment Category (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Sep. 28, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash	$ 158,556	$ 144,184
Amortized Cost	227,502	221,036
Unrealized Gain	32	122
Unrealized Loss	(8)	0
Estimated Fair Value	227,526	221,158
Cash and cash equivalents	174,668	169,732
Marketable securities	52,858	51,426
Level 1:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	16,112	25,548
Estimated Fair Value	16,112	25,548
Cash and cash equivalents	16,112	25,548
Level 1: | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	16,112	25,548
Estimated Fair Value	16,112	25,548
Cash and Cash Equivalents	16,112	25,548
Level 2:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	52,834	51,304
Estimated Fair Value	52,858	51,426
Cash and Cash Equivalents	0	0
Unrealized Gain	32	122
Unrealized Loss	(8)	0
Marketable securities	52,858	51,426
Level 2: | U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	52,834	51,304
Estimated Fair Value	52,858	51,426
Cash and Cash Equivalents	0	0
Unrealized Gain	32	122
Unrealized Loss	(8)	0
Marketable securities	$ 52,858	$ 51,426

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