Revenue and geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 175,098	$ 210,173	$ 737,181	$ 706,544
Sonos speakers
Disaggregation of Revenue [Line Items]
Revenue	116,367	160,505	583,044	596,611
Sonos system products
Disaggregation of Revenue [Line Items]
Revenue	47,202	38,564	108,723	90,998
Partner products and other revenue
Disaggregation of Revenue [Line Items]
Revenue	11,529	11,104	45,414	18,935
Americas
Disaggregation of Revenue [Line Items]
Revenue	101,964	116,344	405,158	375,071
Europe, Middle East and Africa (“EMEA”)
Disaggregation of Revenue [Line Items]
Revenue	57,252	79,307	269,990	295,387
Asia Pacific (“APAC”)
Disaggregation of Revenue [Line Items]
Revenue	15,882	14,522	62,033	36,086
United States
Disaggregation of Revenue [Line Items]
Revenue	94,755	109,852	372,028	346,964
Germany
Disaggregation of Revenue [Line Items]
Revenue	6,754	20,085	65,742	76,140
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	11,927	15,729	61,234	70,226
Other countries
Disaggregation of Revenue [Line Items]
Revenue	$ 61,662	$ 64,507	$ 238,177	$ 213,214