Noncontrolling Interests (Details)	3 Months Ended	6 Months Ended
	Mar. 29, 2025 shares	Mar. 29, 2025 shares
Common Stock, Shares, Outstanding [Roll Forward]
Beginning of period (in shares)	587,419,729	585,963,959
Issuance (in shares)	1,493,564	3,146,235
Exchanges (in shares)	0	0
Cancellation (in shares)		(196,901)
End of period (in shares)	588,913,293	588,913,293
Symbotic, Inc.
Common Stock, Shares, Outstanding [Roll Forward]
Ownership percentage	100.00%	100.00%
Class A Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Beginning of period (in shares)	106,521,915	104,689,377
Issuance (in shares)	1,493,564	3,146,235
Exchanges (in shares)	365,293	545,160
Cancellation (in shares)		0
End of period (in shares)	108,380,772	108,380,772
Class A Common Stock | Symbotic, Inc.
Common Stock, Shares, Outstanding [Roll Forward]
Ownership percentage	18.40%	18.40%
Class V-1 and Class V-3 Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Beginning of period (in shares)	480,897,814	481,274,582
Issuance (in shares)	0	0
Exchanges (in shares)	(365,293)	(545,160)
Cancellation (in shares)		(196,901)
End of period (in shares)	480,532,521	480,532,521
Class V-1 and Class V-3 Common Stock | Symbotic, Inc.
Common Stock, Shares, Outstanding [Roll Forward]
Ownership percentage	81.60%	81.60%