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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Sep. 25, 2021
Computer Equipment And Software Furniture And Fixtures And Test Equipment [Member] | Maximum [Member]
Schedule Of Estimated Useful Lives Of Property And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computer Equipment And Software Furniture And Fixtures And Test Equipment [Member] | Minimum [Member]
Schedule Of Estimated Useful Lives Of Property And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Leasehold Improvements [Member]
Schedule Of Estimated Useful Lives Of Property And Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Shorter of estimated useful life or remaining term of the lease

X

- Definition

Schedule of estimated useful lives of property and equipment [Line Items].

+ References

No definition available.

+ Details

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Namespace Prefix:	sym_
Data Type:	xbrli:stringItemType
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X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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