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Balance sheet components - Change in deferred revenue (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2018 | Jul. 01, 2017
Contract with Customer, Liability [Roll Forward] |  |
Deferred revenue, beginning of period | $ 45,567 | $ 36,160
Recognition of revenue included in beginning of period deferred revenue | (8,367) | (5,171)
Revenue deferred, net of revenue recognized on contracts in the respective period | 18,594 | 11,817
Deferred revenue, end of period | $ 55,794 | $ 42,806

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- Definition Contract With Customer, Liability, Recognition Of Period Deferred Revenue + References No definition available. + Details
Name: | sono_ContractWithCustomerLiabilityRecognitionOfPeriodDeferredRevenue
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
Name: | sono_ContractWithCustomerLiabilityRevenueDeferredNetofRevenueRecognizedOnContracts
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant