Cover - USD ($)	12 Months Ended
	Sep. 24, 2022	Dec. 05, 2022	Mar. 26, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 24, 2022
Current Fiscal Year End Date	--09-24
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Public Float			$ 319,895,200
Documents Incorporated by Reference	The registrant intends to file a definitive proxy statement pursuant to Regulation 14A within 120 days of the end of the fiscal year ended September 24, 2022. Portions of such proxy statement are incorporated by reference into Items 10, 11, 12, 13, and 14 of Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001837240
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		58,497,230
Class V-1 Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		78,476,494
Class V-3 Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		416,933,025