Noncontrolling Interests (Details)	3 Months Ended	6 Months Ended
	Mar. 30, 2024 shares	Mar. 30, 2024 shares
Common Stock, Shares, Outstanding [Roll Forward]
Beginning of period (in shares)	573,109,172	556,572,919
Issuance (in shares)	10,852,700	27,388,953
Exchanges (in shares)	0	0
End of period (in shares)	583,961,872	583,961,872
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)	85,106,588	82,112,881
Issuance (in shares)	10,852,700	11,518,542
Exchanges (in shares)	5,236,000	7,563,865
End of period (in shares)	101,195,288	101,195,288
Class A Common Stock | Symbotic, Inc.
Common Stock, Shares, Outstanding [Roll Forward]
Ownership percentage	17.30%	17.30%
Class V-1 and Class V-3 Common Stock
Common Stock, Shares, Outstanding [Roll Forward]
Beginning of period (in shares)	488,002,584	474,460,038
Issuance (in shares)	0	15,870,411
Exchanges (in shares)	(5,236,000)	(7,563,865)
End of period (in shares)	482,766,584	482,766,584
Class V-1 and Class V-3 Common Stock | Symbotic, Inc.
Common Stock, Shares, Outstanding [Roll Forward]
Ownership percentage	82.70%	82.70%