Income Taxes - Components of Income/(Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022
Income Tax Examination [Line Items]
Total	$ (80,460)	$ (212,514)	$ (139,089)
U.S.
Income Tax Examination [Line Items]
Total	(81,301)	(216,891)	(144,119)
Foreign
Income Tax Examination [Line Items]
Total	$ 841	$ 4,377	$ 5,030