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Balance Sheet Components - Change in deferred revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019
Contract with Customer, Liability [Roll Forward] |  |
Deferred revenue, beginning of period | $ 62,389 | $ 56,449
Recognition of revenue included in beginning of period deferred revenue | (3,357) | (3,238)
Revenue deferred, net of revenue recognized on contracts in the respective period | 9,809 | 8,435
Deferred revenue, end of period | $ 68,841 | $ 61,646

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- Definition Contract With Customer, Liability, Recognition Of Period Deferred Revenue + References No definition available. + Details
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Namespace Prefix: | sono_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract With Customer, Liability, Revenue Deferred, Net of Revenue Recognized On Contracts + References No definition available. + Details
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Namespace Prefix: | sono_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability [Roll Forward] + References No definition available. + Details
Name: | sono_ContractwithCustomerLiabilityRollForward
Namespace Prefix: | sono_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant