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Summary of significant accounting policies - Summary of changes in allowance for sales incentives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Allowance for Sales Incentives [Roll Forward] |  |  |
Beginning balance | $ 11,195 | $ 8,913 | $ 6,235
Charged to revenue | 90,246 | 65,879 | 34,627
Utilization of sales incentive allowance | (89,687) | (63,597) | (31,949)
Ending balance | $ 11,754 | $ 11,195 | $ 8,913

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- Definition Allowance For Sales Incentives + References No definition available. + Details
Name: | sono_AllowanceForSalesIncentives
Namespace Prefix: | sono_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Sales Incentives, Charge To Revenue + References No definition available. + Details
Name: | sono_AllowanceforSalesIncentivesChargetoRevenue
Namespace Prefix: | sono_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance for Sales Incentives [Roll Forward] + References No definition available. + Details
Name: | sono_AllowanceforSalesIncentivesRollForward
Namespace Prefix: | sono_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for Sales Incentives, Utilization of Sales Incentives Allowance + References No definition available. + Details
Name: | sono_AllowanceforSalesIncentivesUtilizationofSalesIncentivesAllowance
Namespace Prefix: | sono_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration