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Revenue and Geographic Information - Disaggregation of revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 339,837	$ 249,310	$ 175,098	$ 562,083	$ 294,160	$ 260,119	$ 210,173	$ 496,371	$ 1,326,328	$ 1,260,823	$ 1,137,008
Sonos speakers
Disaggregation of Revenue [Line Items]
Revenue									1,034,813	1,008,422	965,066
Sonos system products
Disaggregation of Revenue [Line Items]
Revenue									218,788	187,172	156,583
Partner products and other revenue
Disaggregation of Revenue [Line Items]
Revenue									72,727	65,229	15,359
Americas
Disaggregation of Revenue [Line Items]
Revenue									755,874	678,224	603,450
Europe, Middle East and Africa ("EMEA")
Disaggregation of Revenue [Line Items]
Revenue									470,883	484,785	478,518
Asia Pacific ("APAC")
Disaggregation of Revenue [Line Items]
Revenue									99,571	97,814	55,040
United States
Disaggregation of Revenue [Line Items]
Revenue									697,410	630,012	554,896
Germany
Disaggregation of Revenue [Line Items]
Revenue									109,124	124,385	121,546
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue									112,446	112,708	114,790
Other countries
Disaggregation of Revenue [Line Items]
Revenue									$ 407,348	$ 393,718	$ 345,776

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