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Income Taxes - Summary of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Valuation Allowance [Roll Forward]
Beginning balance	$ 216,365	$ 185,840	$ 162,267
Increase during the period	21,903	32,573	23,628
Decrease during the period	0	(2,048)	(55)
Ending balance	$ 238,268	$ 216,365	$ 185,840

X

- Definition

Deferred Tax Assets, Valuation Allowance [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	sono_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Decrease, Amount

+ References

No definition available.

+ Details

Name:	sono_ValuationAllowanceDeferredTaxAssetDecreaseAmount
Namespace Prefix:	sono_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Increase, Amount

+ References

No definition available.

+ Details

Name:	sono_ValuationAllowanceDeferredTaxAssetIncreaseAmount
Namespace Prefix:	sono_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant