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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

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- 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