Mergers and Acquisitions - Reconciliation of Business Combination (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2024	Sep. 24, 2022
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Cash proceeds from SVF 3, net of redemptions		$ 47,021
Cash proceeds from PIPE Financing		205,000
Cash proceeds from forward purchase agreement		200,000
Less: cash payment of transaction expenses and underwriting fees - SVF 3		(30,315)
Net cash proceeds from the Business Combination and PIPE Financing		421,706
Less: repurchase by Symbotic Inc. of New Symbotic Holdings Common Units	$ (300,000)	(300,000)
Cash received for Class V-1 and Class V-3 Common Stock		70
Less: transaction expenses - Symbotic	(37,100)	(37,104)
Net contributions from the Business Combination	$ 84,700	$ 84,672