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Revenue and geographic information - Disaggregation of revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Disaggregation of Revenue [Line Items]
Revenue	$ 272,940	$ 208,398	$ 186,720	$ 468,950	$ 214,095	$ 223,078	$ 182,546	$ 372,807	$ 1,137,008	$ 992,526	$ 901,284	$ 843,524
Wireless speakers
Disaggregation of Revenue [Line Items]
Revenue									546,649	480,977	462,967
Home theater speakers
Disaggregation of Revenue [Line Items]
Revenue									418,416	348,899	274,268
Components
Disaggregation of Revenue [Line Items]
Revenue									150,436	151,965	151,658
Other
Disaggregation of Revenue [Line Items]
Revenue									21,507	10,685	12,391
Americas
Disaggregation of Revenue [Line Items]
Revenue									603,450	496,668	443,314
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue									478,518	442,081	415,689
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue									55,040	53,777	42,281
United States
Disaggregation of Revenue [Line Items]
Revenue									554,896	449,261	399,531
Germany
Disaggregation of Revenue [Line Items]
Revenue									121,546	111,065	93,824
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue									114,790	110,695	120,732
Other countries
Disaggregation of Revenue [Line Items]
Revenue									$ 345,776	$ 321,505	$ 287,197

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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