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Revenue and geographic information - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 208,398 | $ 223,078 | $ 864,069 | $ 778,431
Wireless speakers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 93,867 | 92,797 | 453,185 | 389,300
Home theater speakers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 66,732 | 83,928 | 283,952 | 266,972
Components |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 42,283 | 44,160 | 113,530 | 114,007
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 5,516 | 2,193 | 13,402 | 8,152
Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 122,982 | 114,707 | 447,705 | 388,620
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 75,585 | 95,802 | 374,790 | 349,327
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9,831 | 12,569 | 41,574 | 40,484
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 113,558 | 106,364 | 409,701 | 352,194
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 17,930 | 20,500 | 88,421 | 88,505
Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18,512 | 25,973 | 95,720 | 86,308
Other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 58,398 | $ 70,241 | $ 270,227 | $ 251,424

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- Definition 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 -Subparagraph (a) -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 + Details
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