v3.26.1
Noncontrolling Interests (Details) - shares
 3 Months Ended 9 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Common Stock, Shares, Outstanding [Roll Forward]        
Beginning balance, outstanding (in shares) 602,515,397 588,913,293 590,888,439 585,963,959
Beginning balance, issued (in shares) 602,515,397 588,913,293 590,888,439 585,963,959
Issuances (in shares) 1,348,581 914,007 12,975,539 4,060,242
Exchanges (in shares) 0 0 0 0
Cancellations (in shares)   0   (196,901)
Ending balance, outstanding (in shares) 603,863,978 589,827,300 603,863,978 589,827,300
Ending balance, issued (in shares) 603,863,978 589,827,300 603,863,978 589,827,300
Symbotic, Inc.        
Common Stock, Shares, Outstanding [Roll Forward]        
Ownership percentage 100.00% 100.00% 100.00% 100.00%
Class A Common Stock        
Common Stock, Shares, Outstanding [Roll Forward]        
Beginning balance, outstanding (in shares) 127,015,993 108,380,772 112,635,932 104,689,377
Beginning balance, issued (in shares) 127,015,993 108,380,772 112,635,932 104,689,377
Issuances (in shares) 1,348,581 914,007 12,975,539 4,060,242
Exchanges (in shares) 567,077 958,154 3,320,180 1,503,314
Cancellations (in shares)   0   0
Ending balance, outstanding (in shares) 128,931,651 110,252,933 128,931,651 110,252,933
Ending balance, issued (in shares) 128,931,651 110,252,933 128,931,651 110,252,933
Class A Common Stock | Symbotic, Inc.        
Common Stock, Shares, Outstanding [Roll Forward]        
Ownership percentage 21.40% 18.70% 21.40% 18.70%
Class V-1 and Class V-3 Common Stock        
Common Stock, Shares, Outstanding [Roll Forward]        
Beginning balance, outstanding (in shares) 475,499,404 480,532,521 478,252,507 481,274,582
Beginning balance, issued (in shares) 475,499,404 480,532,521 478,252,507 481,274,582
Issuances (in shares) 0 0 0 0
Exchanges (in shares) (567,077) (958,154) (3,320,180) (1,503,314)
Cancellations (in shares)   0   (196,901)
Ending balance, outstanding (in shares) 474,932,327 479,574,367 474,932,327 479,574,367
Ending balance, issued (in shares) 474,932,327 479,574,367 474,932,327 479,574,367
Class V-1 and Class V-3 Common Stock | Symbotic, Inc.        
Common Stock, Shares, Outstanding [Roll Forward]        
Ownership percentage 78.60% 81.30% 78.60% 81.30%