Cover - shares	9 Months Ended
	Jun. 25, 2022	Aug. 04, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 25, 2022
Document Transition Report	false
Entity File Number	001-40175
Entity Registrant Name	SYMBOTIC INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1572401
Entity Address, Address Line One	200 Research Drive
Entity Address, City or Town	Wilmington
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01887
City Area Code	978
Local Phone Number	284-2800
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	SYM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001837240
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--09-24
Common Shares, Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		54,280,146
Common Voting Shares, Class V-1
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		80,844,573
Common Voting Shares, Class V-3
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		416,933,025