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Variable Interest Entities - Narrative (Details) - USD ($)	Jul. 23, 2023	Sep. 28, 2024
Variable Interest Entity [Line Items]
Symbotic's Maximum Exposure to Loss		$ 1,639,900,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Symbotic's Maximum Exposure to Loss		1,639,942,000
Investments in unconsolidated VIE		$ 81,289,000
GreenBox Systems LLC \| Symbotic Holdings LLC
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	35.00%
GreenBox Systems LLC \| Sunlight Investment Corp.
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	65.00%