Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2019	Nov. 08, 2019	Mar. 29, 2019
Document Information [Abstract]
Entity Registrant Name	Sonos Inc
Entity Central Index Key	0001314727
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Sep. 28, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		108,418,445
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Smaller Reporting Company	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 760.8