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Leases - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Leases [Abstract] |  |  |
Operating Lease Rent Expense Net | $ 2.3 | $ 2.0 | $ 1.9
Lease Expiration Date | 2025-12 |  |

X
- Definition Lease Expiration Date. + References No definition available. + Details
Name: | sym_LeaseExpirationDateOne
Namespace Prefix: | sym_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Lease Rent Expense Net + References No definition available. + Details
Name: | sym_OperatingLeaseRentExpenseNet
Namespace Prefix: | sym_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration